CONNECT MAPPING THE THE HIGHWATER DOTS AND HAZARDS HISTORY OF BOULDER CREEK Mary Miss 2007 Boulder Museum of Contemporary Art, ‘Weather Report: Art and Climate Change’
The process of focusing on an ephemeral event outside memory or experience produces an alternative kind of map of the city. Rather than claiming property or territory, it uses the infrastructure of the city--its bridges, stairs, streets and buildings--to create a three dimensional map which makes apparent the ever changing presence of water. Instead of an abstraction, it is a mapping that makes apparent the constancy of change.
This project is intended to bring attention to the possible flooding of Boulder Creek. It suggests some of the issues to be considered and how this information might be revealed. A fully implemented project would deal with these points and others in detail; it would be an ongoing collection of information involving experts in the field as well as the observations of the residents of Boulder
In the spring of 1894, a 100 year flood event occurred in downtown Boulder. Flash floods in Boulder Creek caused widespread damage as the city was inundated. Smaller floods have occurred in 1914, 1919, 1921, 1938 and 1969. The 100 year flood is used by FEMA to regulate flood plain management. Many experts believe it would be prudent for communities to be prepared for a 500 year flood event. A 100 year flood has 1% chance of occurring in any given year, a 500 year flood has a .2% chance of occurring. It is possible for two or more such events to occur in a single year. New weather patterns make the forecasting of such events less predictable: Hurricane Katrina had a .25% chance of occurring. The city of Boulder is located at the mouth of Boulder Canyon. Because of its location, the nature of the steep slopes and long approach upstream the city is highly susceptible to flooding. The city is considered to be a high hazard zone where the question is not if there will be a flood but when will it happen.
k CREEK Gregory Cree
22nd St
St
19th St
iterock Ditch Boulder & Wh
23rd St
DITCH
Balsa m
19th St
22nd St
Goss St
Grove St Arapahoe Av
Naropa University
19th St
15th St
Stadium Dr
Taft Dr
Macky Dr
CREEK
St
20th St
7th St
5320
A
EE
K
University Heights
CR
Pennsylvania Av
Colorado Av
Engineering Dr
Euclid Av
Libby Dr
Mary Miss Installation Baker Dr Location Map Wardenburg Dr
16th St
Willard Loop Dr
Cockerell Dr
14th St
10th St
Euclid Av
18th St
College Av 13th St
12th St
11th St
College Av
Regent Dr
0
Walnut S t
Hillside Rd
15th St
DITC H 5520
t
ce S
Spru
Folsom St
23rd St
21st St
Goss St
Athens St
k
13th St
CREEK-IN T
t South
19th St
18th St
St
t
ff Rd
Pl 24th
S 23rd
St
St
St
19th
22nd
20th
St 21st
DITC
Colorado Av
Lincoln Pl
6th St
5600
Euclid Av
r
ll D
Hi
Grant Pl
e
s Ro
8th St
d fR taf
gs
Flagsta
St 20th
St
15th
St
S 11th
5480
Fla
6320
St
St 26th
St 24th
St 22nd
Pine
Marine St
Boulder Cree
St
Jay St
20
DITCH
9th St 9th St
Hapgood St
59
St
Arapahoe Av
Pleasant St
5440
tch Dean Pl
Jay St
Di
10th
ion
ln Pl
ns
Linco
xte
Bluff
Boulder & Lefthand Ditch
Arapahoe Av
Boulder High School
Central Park
Grand View Av
8th St
nE
Av
Grove St
BMOCA
University Av
t
rso
8th S
7th St
de
Dr
St
St
13th
t
6th St 6th St
5th St
An
Mesa
St
St
t
t
t
t
4th St
5400
Marine St
Boulder Library
l St
v
on B
Cany
Central Municipal Center Park
9th S
8th S
t
5th S
4th S
Arapahoe Av
Panorama Av
H
14th
S 11th
t
t
t
v
00
Alpine Av
St
Pear
ut Waln
t
CREEK
nW
eL
o ah
p
Ara
hoe A v
7th S
5th S
4th S
3rd S
Eben Fine Park Arapa
Pear
on B
Cany
dway
r
H B
8th S
dD
TC
DI
rl St
Pea
St
l St
St 10th
oo Spru
Pearl n Ct eaco
Rd
Broa
r
D
ollw t ce S
17th
15th
k
Kn
c Spru
St 16th
dway
e St
c Spru
54
18th
St 15th
Broa
7th St
6th St
oc
R
5th St
en re
G
in View
ke Ditch
Silver La
e St
Mounta
leton
Map
Pine
9th St
CREEK-INT
Mapleton Av
Alpine Dr
St 21st
St 18th
High St
Maxwell Av
Maxwell Av
Highland Av
17th St
et Bv
Portla
11th St
7th St
5760
10th St
500 YEAR FLOOD PLAIN
5400
Suns
l nd P
Portland Pl
500 YEAR FLOOD PLAIN Concord Av
15th St
Dewey Av
11th St
North St 10th St
4th St
North St
Farmers Ditch
5th St
8th St
14th St
7th St
6th St
5th St
Alpine Av
INT EKCRE
Valley View Dr
Alpine Av
Tyler Rd
THE PROJECT How can the imagination be provoked to envision an event outside our daily experience? How can the predicted flooding of Boulder Creek be made tangible to the residents of this city? Downtown Boulder, from Eben G. Fine Park to Folsom Street, is the focus of this project. A series of modest scale elements will be integrated into the fabric of the city to help residents better understand the nature of floods. As residents go about their daily lives, they will come across fragments of information which, over time, will give them a clearer sense of their relationship to this aspect of their immediate environment. A three-dimensional mapping of the 500 year floodwaters’ predicted depth and extent is marked with circular blue discs: Along Boulder Creek, blue circular markers are attached to trees and fences to show the height of the water during a 500-year flood. Various buildings in the floodplain such as the Library, Boulder High School and Municipal Building also have highwater marks. Large boulders that were moved by pre-historic floods are marked with blue dots. Blue dots marking the 500 year floodplain limit are painted on the side walks and streets at key intersections. GIS (Geographic Information Systems) is used to reveal detailed informa tion about the watershed, Boulder Creek, its potential floods and its his tory. Data could be updated as needed. Looking from one point to the next, connecting the dots, the level and extent of a flood is no longer abstract.
These are studies which have not been implemented
STUDY PROJECT To more fully reveal the nature, characteristics, and history of Boulder Creek’s floods, an additional series of elements are proposed: A series of seating areas are created adjacent to the creek, each focusing on a single aspect of the creek. Highwater alert signal lights are located at each seating area.
Water gauges are placed on an abutment of each bridge to show historic flood levels and predicted flood water depths for each location. Steps and stairs along the creek are marked to show seasonal changes in the water level. GIS might be made accessible to the public at a dedicated computer station in the Boulder Library. Residents, having been made aware of the different aspects of highwater, could come here for more information. Videos of previous floods, photographs, written descriptions, audio recordings about Boulder Creek by a politician, a poet or hydrologist could be made available here. Wall of water: a nine foot high undulating wire mesh fence gives a suggestion of the condition created by a “flash flood”.
Following are a series of collaged images showing the estimated height and extent of the 500 year flood. Only a few of these have been completed for the exhibition
THE PROJECT
TREES, FENCES, PARKING LOTS MARKED TO SHOW HIGH WATER LEVEL
The positions of the dots are approximate and are based on our best interpretation of flood maps and flood plain profiles provided by FEMA and the city of Boulder
MARRIED STUDENT HOUSING
BROADWAY AND CANYON INTERSECTION
The dots shown here are schematic and indicate approximate locations
KEY BUILDINGS MARKED TO SHOW 500 YR FLOOD PLAIN Naropa University
Boulder Museum of Contemporary Art
Boulder High School
Boulder Public Library
Historic Highland Building
One Boulder Plaza
Boulder County Municipal Building
Boulder Municipal Center
9th street between Pearl and Walnut
13th Street and Canyon
17th Street and Canyon
Broadway and Canyon
STREETS AND SIDEWALKS MARKED TO SHOW 500 YR FLOOD PLAIN
Boulders over 6ft across near the Justice Center were used to calculate the floods necessary to move them. University of Coloradogeology professor Bill Bradley(ret.) and former graduate student Art Mears calculated that they were moved by discharges and velocities within the estimated range of the 500-year flood
BOULDERS MOVED BY PRE-HISTORIC FLOODWATERS MARKED
GIS mapping is used to reveal detailed information about the Boulder Creek watershed, its potential to flood, and its history
A preliminary version will be available during the exhibit on the website www.marymiss.com
(news)
To more fully reveal the nature, characteristics and history of Boulder Creek floods ideas for an additional series of elements are proposed.
These are studies which have not been implemented
STUDY PROJECTS
A SERIES OF SEATING AREAS ADJACENT TO CREEK, EACH FOCUSING ON A SINGLE ASPECT OF FLOODING
TIME, VELOCITY, VOLUME, DISCHARGE, SPACE (WIDE & NARROW), SURFACE PERMEABILITY (HIGH & LOW),
GLOBAL WARMING, TRIBUTARIES, WATERSHEDS
Audio descriptions of Boulder Creek
HIGH WATER ALERT SIGNAL LIGHTS AT SEATING AREA ALONG CREEK Maps and Photographs
Seating areas of curving 12� bands of steel give information about Boulder Creek
Paved surfaces prevent rain and snow melt form percolating into the ground, causing large volumes of water to enter streams rapidly
Heavy thunderstorms can saturate the soils and cause intense runoff. This will sometimes result in a large volume of water accumulating in a short period of time, creating a wall of water that could range from a few feet high to ten feet or higher. A nine foot high undulating steel mesh fence gives the viewer a sense of the proportion of such an event.
WALL OF WATER
BRIDGE WATER GAUGES INDICATE POSSIBLE WATER DEPTH AND SHOW HISTORIC FLOOD LEVELS
F L O O D WATERS WILL BE AT DIFFERENT LEVELS AT EACH BRIDGE AS THE FLOODWATER SPREADS OUT AS IT MOVES DOWNSTREAM
STEPS AND STAIRS STEPS ALONG CREEK MARKED TO SHOW RISING STREAM LEVEL
HIGHWATER
HISTORY HAZARDS
The multiple aspects of Boulder Creek and its flood waters could be made accessible through the mapping capabilities of GIS
GIS PROJECT
AUDIO TAPES VOICES DESCRIBING DIFFERENT ASPECTS OF BOULDER CREEK:
ADDITIONAL STORIES, IMAGES AND DESCRIPTIONS ARE ADDED OVER TIME
SCIENTISTS POET POLITICIAN RESIDENT
WRITTEN DESCRIPTIONS OF PREVIOUS FLOODS
VIDEO OF 1969 FLOOD
DETAILED INFORMATION IN THE FORM OF ARTICLES, SCIENTIFIC STUDIES, AND GRAPHS REVEAL ASPECTS OF THE CREEK IN DETAIL.
BOULDER HAS 13 CREEKS FLOWING WEST TO EAST, NORTH / SOUTH TRAVEL BECOMES DANGEROUS IN FLOODS FOREST FIRE DAMAGE CAN CHANGE WATERSHED CHARACTERISTICS; LESS ABSORPTION, QUICKER RUNOFF
TIME, VELOCITY, VOLUME, DISCHARGE, SPACE (WIDE & NARROW), SURFACE PERMEABILITY (HIGH & LOW),
GLOBAL WARMING, TRIBUTARIES, WATERSHEDS
HISTORIC FLOODS 1894 -12,000 CFS 1914 - 5,000 CFS 1919 1921 - 3,000 CFS 1938 - 4,410 CFS 1969 - 3,000 CFS
SMALLER FLOODS 1876, 1885, 1887, 1897, 1904, 1909, 1941, 1950, 1951, 1955, 1972, 1989, 1990, 1992, 1996
Flood Heights Above Streambed FEMA 1990
RECCURENCE INTERVAL 10 years
50 years
100 years
500 year
4.5'
6'
6.5'
8'
4'
10'
12'
14'
3'
7'
8'
12'
Millenium Footbridge
7'
10
10
13'
Staduim
6
11
12'
13
19th Street Bridge
6'
10'
12
16
17th Street
7'
17'
17'
19'
6.5'
12.5'
14'
15.5'
6'
8'
10'
12'
5'
10'
11'
15'
6th Street
6'
12'
16'
20'
Eben Fine
6'
11'
13'
16'
28th Street
13th Street Broadway 9th Street
Underpasses
30th Street underpass
Bridges
47th Street
100 YEAR FLOOD - USED BY FEDERAL EMERGENCY MANAGEMENT AGENCY TO REGULATE FLOODPLAIN MANAGEMENT MEANS 1% CHANCE OF FLOOD BEING EQUALED OR EXCEEDED IN ANY GIVEN YEAR COULD COME FROM A STORM PRODUCING AS LITTLE AS 2.5-3” OF RAIN IN 1 TO 2 HOURS OR FROM A LONG DURATION STORM OVER SEVERAL DAYS. THESE STORMS HAPPEN 150 TIMES A YEAR IN COLORADO BECAUSE OF WARMING THERE MAY BE AN INCREASE IN FREQUENCY OF THESE EVENTS
FLOW RATE CFS - CUBIC FEET PER SECOND OF WATER FLOW AVERAGE FLOW RATES DECEMBER - 28 CFS JUNE - 317 CFS PEAK RAINFALL - 700 CFS (OVER 500 CFS DANGEROUS TO TUBERS) 100 YEAR FLOOD - 12,000 CFS AT MOUTH OF CANYON BURST UPSTREAM DAM - 703,000 CFS AT MOUTH OF CANYON
PHOTOS OF 1894 FLOOD
CIRCULAR ENAMELED HISTORICAL FLOOD PHOTOGRAPHS LOCATED AT THE SITE EACH WAS TAKEN 1894 PHOTOS COURTESY OF THE CARNEGIE BRANCH LIBRARY FOR LOCAL HISTORY
BOULDER CREEK IS IN THE SOUTH PLATTE RIVER WATERSHED AT THE HEADWATERS OF THE VAST MISSISSIPPI DRAINAGE SYSTEM
A SERIES OF MAPS REVEAL INFORMATION ABOUT THE WATERSHED
Mississippi River Watershed
Frederick
Panama Res # 1
Barker Res
dle Mid er Bould
Cr
Lafayette
36
" Marshall
Louisville
WELD CO
BOULDER CO
Cr
Baseline Res
PLAINS
Marshall Gross S outh Lake Res " Superior Eldorado r Broomfield kC BOULDER CO Springs c Ro
JEFFERSON CO 119
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Boulder Creek Watershed Lodg
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North
River e Platt
COLORADO
ek
Boulder Creek Watershed
Cr Boulder Clear Cr Bear Cr
Cre
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Creek
e Tre Cache La P ou d
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WYOMING NEBRASKA
Bea ver reek C
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MOUNTAINS
R
GILPIN CO
Cr
Boulder
Pla tte
Con tine n
tal
BOULDER CO
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WAT E R S H E D STARTING AT CONTINENTAL DIVIDE IS 453 SQ. MILES. BOULDER CREEK DRAINAGE BASIN IS 132 SQ MILES ABOVE THE CITY OF BOULDER
BROOMFIELD CO
Indian Peaks Wilderness Area Nederland
Lakewood Cr Res lder r u o C B er uld Bo
Cr.
72
th
£ ¤ Erie 287
Valmont Res 7
Boulder
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Cr
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City of Boulder protected watershed ge d i R property wot
South
South Platte River Watershed
GIS mapping is used to reveal detailed information about the Boulder Creek watershed, its potential to flood, and its history
GIS MAP LIST:
500 year flood zone Historic Districts Parks and Open Space Neighborhoods Foot and Vehicular Bridge Project Locations Historic Photo Locations Geologic Hazard Zones and Natural Landmarks Streams Hydrology
A preliminary version will be available during the exhibit on the website www.marymiss.com
(news)
St
22
Boulder & W hiterock Ditch
22nd St
21st St
A
Colorado Av
Streams_usgs
Baker Dr
Hydrology_Line
Euclid Av
Cockerell Dr
Contour Lines Hydrology_Lakes
Wardenburg Dr 16th St
0
250
500
Buildings 1,000 Feet
Willard Loop Dr
500-Year Flood Plain Parks & Open Space
Engineering Dr
Major Roads Streets
Regent Dr
55 20
Balsa m
19th St
DITC H
St
CREEK
Gregory Cree k
CREEK CR EE K
University Heights
Legend Libby Dr
18th St
Euclid Av
14th St
CREE K
Taft Dr
5360
Macky Dr
College Av
15th St
58 00
54 8 0
19th
DITCH 7th St
0
20th St
Stadium D r
13th St
60 0 0
Arapahoe Av
Arapahoe Av 19th St
18th St
17th St
15th St
CREEK-I NT
Folsom St
5320
Grove St
t
13th St
12th St
Rd
Folsom St
23rd St
21st St
19th St
18th St
S 15th
Grove St
Goss St
Pennsylvania Av
11th St
College Av
10th St
Flagsta ff
l
t
t
t
Goss St
Colorado Av
Lincoln Pl
61 20 60 80
P 24th
St
S 23rd
22nd
St 21st
St 20th
S 19th
St
t
t St
DITCH
9th St 9th St
62 00
t
t
Walnut S t
Hillside Rd
Pleasant St
Grant Pl
8th St
63 20
t
t
t
Boulder Cree k
Grand View Av
Pl
8th St
6th St
5600
Gilbert St
se Ro Euclid Av
r ll D Hi
S 26th
S 24th
St
St 21st
S 20th
S 18th t
S 15th t S 13th
S 11th 10th
ln Linco
Grand View Av
University Av University Av
5480
ce S Spru
Athens St
5440
Jay St
57 60
58 40
INT
t 8th S
Di tc h Dean Pl
Jay St
56 80
d fR taf gs Fla
6160
CRE EK-
Goss St
Arapahoe Av
ln Pl
7th St
sio n
Hapgood St
58 00 59 20 58 80
H DITC
Boulder & Lefthand Ditch
Grove St
Arapahoe Av
Linco
6th St 6th St
5th St
xte n
5720
Waln
Bv
t
t
on E
t
ut St Waln ut S t
t on Cany
v on B Cany
t 5th S
4th S
t
4th St
K-INT CREE
ers
S Bluff
South
S 14th
S 11th
S 10th
t 9th S
t 8th S
t 7th S
t 5th S
t 4th S 3rd S
5400
An d
t
l St Pear
S 17th
t
St 15th
dway Broa
St 11th
t
t 8th S
Dr
S 10th
od
Arapahoe Av
55 20
5960
S 16th
t
r D
o llw CREEK
Marine St 5560
l St Pear
l St Pear
n Av
t
S 15th
dway Broa
t ce S Spru
LATER AL
nW eL
Panorama Av
Dr Mesa
S 18th
11th St
10th St
9th St
k oc R
o Kn Ditch
H TC DI
o ah
54 00
Alpine Av
to Maple
S Pine
St Pin e
t
Alpine Dr
22nd
t Bv
High St
6th St
n
5th St
e re G
ke Silver La
0 56 8
p Ara
62 80
a Portl
7th St
5520
56 40
View R d
l St Pear
7th St
10th St
7th St
56 00
CREEK-INT
Mounta in
ce S Spru
t ce S Spru
oe Av
40 62
11th St
Farmers Ditch
8th St
5th St
4th St
INT
5760
Highland Av
l St Pear t on C Beac
60 40
54 00
e Suns
l nd P
Maxwell Av
Mapleton Av Mapleton Av
Arapa h
63 60 64 00
North St
Portland Pl
Concord Av 500 YEAR FLOOD PLAIN Maxwell Av
5th St
th St
St
St
5th St
Alpine Av
North St
Alpine Av
Dewey Av
5720
58 00
5680
5640
EKCRE
Valley View Dr
Tyler Rd
22nd
St Balsa m
Dr Mesa
t
S 20th
S Pine
Boulder & W hiterock Ditch
St Pin e
t
High St
t
t
22nd St
BOULDER HIGH SCHOOL
5360
University BUNGALOW
Heights A
CHAMBERLAIN
EBEN FINE PARK
Colorado Av
EXPANDED HIGHLAND LAWN EXPANDED UNIVERISTY HILL HIGHLAND LAWN
13th St
HILLSIDE MAPLETON SOUTH STREET
Baker Dr
UNIHILL UNIVERSITY
Euclid Av
Cockerell Dr
14th St
Euclid Av
Libby Dr
WALNUT
Wardenburg Dr 16th St
0
250
500
WEST PEARL 1,000 Feet
Willard Loop Dr
WHITTIER Parks & Open Space
Engineering Dr
College Av
18th St
College Av
15th St
54 8 0
19th St
21st St
Taft Dr
Buildings
Historic Districts
Regent Dr
CREEK
Gregory Cree k
7th St
0
CREEK
Contour Lines Hydrology_Lakes
Stadium D r Macky Dr
CR EE K
Streams_usgs Hydrology_Line
DOWNTOWN
12th St
CREE K
Streets
Pennsylvania Av
11th St
60 0 0
Legend
Hillside Rd
15th St
13th St
CREEK-I NT
Arapahoe Av Arapahoe Av
Colorado Av
10th St
Rd
20th St
19th St
17th St
t
Flagsta ff
t
Marine St
Folsom St
Grove St
22nd St
5320
Grove St
t
S 11th DITCH
Lincoln Pl
61 20 60 80
Folsom St
21st St
19th St
18th St
S 15th
S 13th
Goss St
Boulder Cree k
St
62 00
l St
Goss St
h 10t
63 20
P 24th
t
t
t
t
t
Goss St
Arapahoe Av
Pleasant St
Grant Pl
8th St
6th St
5600
Gilbert St INT
S 23rd
St
S 19th
22nd
St 21st
t
St 20th
S 18th
t
S 15th S 14th
t
Jay St
57 60
58 40
d fR taf gs Fla
6160
CRE EK-
se Ro Av Euclid
r ll D Hi
Walnut S t
Boulder & Lefthand Ditch
Grove St
Grand View Av
University Av University Av
5480
e St
Major Roads
Av View
9th St 9th St
56 80
Hapgood St
58 00 59 20 58 80
St
5440
Dean Pl
Jay St
Di tc h
ln Pl
sio n
Linco
xte n
5720
South
Athens St
8th St
on E
d Gran
c Spru
ut St Waln
ut Waln
Arapahoe Av
t 8th S
ers
S 17th
S 16th
St 15th
dway Broa
S 11th
t
7th St
5th St
K-INT CREE 63 60 64 00
S 10th
4th St
5400
An d
62 80
t 9th S
6th St 6th St
Arapahoe Av
55 20
5960
t 8th S
t 7th S
t
t
CREEK
W Ln
l St Pear
Bv
LATER AL
Marine St 5560
on Cany
v on B Cany
t 5th S
4th S
3rd S
a
l St Pear
l St Pear
t 5th S
t 4th S
H TC DI
p Ara
t
t 8th S
Dr
View R d
e St
St 11th
od
t ce S Spru
rl St
e ho
S 10th
o llw
Ditch
0 56 8
c Spru
oe Av
40 62
t ce S Spru
r D
o Kn
k oc R
6th St
n
5th St
e re G
ke Silver La
Mounta in
Pea l St Pear t on C Beac
60 40
t
dway Broa
7th St
5520
56 40
Arapa h
S 15th
9th St
CREEK-INT
Highland Av
H DITC
t
v
t
ton A Maple
S 24th
v
Maxwell Av
Mapleton Av Mapleton Av
S 26th
St
S Bluff
St
n
et B Suns
d Pl
S 18th
a Portl
11th St
10th St
7th St
56 00
5760
55 20
Panorama Av
Alpine Av
St 21st
DITC H
54 00
22nd
54 00
Portland Pl
Maxwell Av
Alpine Dr
19th
DITCH
58 00
17th St
11th St
10th St
4th St
North St
Dewey Av
HISTORIC Concord Av DISTRICTS
15th St
North St
Alpine Av
Farmers Ditch
5th St
8th St
4th St
h St
th St
5th St
Alpine Av
INT
5640
58 00
5680 5720
EKCRE
Valley View Dr
Tyler Rd
St
22nd
Boulder & W hiterock Ditch
22nd St
23rd St
21st St
A
Major Roads Streets
Colorado Av
Streams_usgs Contour Lines
Hydrology_Lakes Buildings
Baker Dr
Parks & Open Space
Engineering Dr
Lakes_usgs
Boulder Conservation Easement
Euclid Av
Cockerell Dr
14th St
Euclid Av
Libby Dr
18th St
College Av 13th St
12th St
College Av
Regent Dr
55 20
Balsa m
19th St
DITC H
St
CREEK
Gregory Cree k
CR EE K
University Heights
Pennsylvania Av
11th St
CREE K
Taft Dr
5360
Macky Dr
CREEK
Stadium D r
Boulder Restricted
Wardenburg Dr 16th St
15th St
58 00
54 8 0
19th
DITCH 7th St
0
Arapahoe Av
Hydrology_Line
10th St
60 0 0
20th St
19th St
18th St
17th St
15th St
13th St
CREEK-I NT
Grove St
Folsom St
Grove St
22nd St
5320
Goss St
t
St
Rd
Folsom St
21st St
19th St
18th St
S 15th
Goss St
Colorado Av
Lincoln Pl
Flagsta ff
l
t
t
St
Legend DITCH
9th St 9th St
61 20 60 80
P 24th
St
S 23rd
22nd
St 21st
St 20th
S 19th
t
t
Goss St
t
t
Pl
62 00
t
t
t
Walnut S t
Hillside Rd
Pleasant St
Grant Pl
8th St
63 20
S 26th
t
St
S 24th
22nd
St 21st
S 20th
S 18th
S 15th t S 13th
S 11th 10th
ln Linco
8th St
6th St
5600
Gilbert St
se Ro Euclid Av
r ll D Hi
e St
Boulder Cree k
Grand View Av
University Av University Av
5480
c Spru
Athens St
5440
Jay St
57 60
58 40
INT
t 8th S
Di tc h Dean Pl
Jay St
56 80
d fR taf gs Fla
6160
CRE EK-
H DITC
Arapahoe Av
ln Pl
7th St
sio n
Hapgood St
58 00 59 20 58 80
t
Boulder & Lefthand Ditch
Grove St
Arapahoe Av
Linco
6th St 6th St
5th St
xte n
5720
Waln
t
t
t
4th St
K-INT CREE
on E
S Bluff
ut St Waln ut S t
Bv
v on B Cany
t 5th S
4th S
t 5400
ers
Panorama Av
South
S 14th
S 11th
S 10th
t 9th S
t 8th S
t 7th S
t 5th S
t 4th S 3rd S
Arapahoe Av
t
l St Pear
S 17th
t
St 15th
dway Broa
St 11th
t
t 8th S
Dr
S 10th
od
CREEK
W Ln
An d
5960
on Cany
LATER AL
55 20
5560
S 16th
t
t ce S Spru
r D
o llw
oe
l St Pear
l St Pear
n Av
t
S 15th
dway Broa
k oc R
o Kn Ditch
H TC DI
h pa
54 00
Dr Mesa
to Maple
S Pine
6th St
n
5th St
e re G
ke Silver La
0 56 8
t
Alpine Dr
Alpine Av
S 18th
High St
7th St
5520
56 40
View R d
rl St
Pea l St Pear t on C Beac
17th St
t Bv
St Pin e
t ce S Spru
Marine St
63 60 64 00
n
9th St
CREEK-INT
Mounta in
Ara
62 80
11th St
10th St
7th St
56 00
5760
Highland Av
ce S Spru
oe Av
40 62
a Portl
e Suns
d Pl
Maxwell Av
Mapleton Av Mapleton Av
60 40
54 00
Portland Pl
Maxwell Av
Arapa h
11th St
10th St
4th St
North St
Dewey Av Av Concord PARKS AND OPENSPACE
15th St
North St
Alpine Av
Farmers Ditch
5th St
8th St
4th St
h St
6th St
5th St
Alpine Av
INT
5640
58 00
5680 5720
EKCRE
Valley View Dr
Tyler Rd
0
250
500
Boulder Open Space 1,000 Feet
Willard Loop Dr
Boulder Parks and Recreation Other Open Lands
St Balsa m
22nd
t
St
S Bluff
t
High St
S 20th
S Pine
Boulder & W hiterock Ditch
n Av
t
to Maple
t
t
Folsom St
19th St
22nd St
23rd St
5320
Grove St
Grove St
t
15th St
13th St
CREEK
7th St
21st St
Stadium D r
DITCH
Taft Dr
A University Heights
5360
Macky Dr
CREEK
St
Hillside Rd
Pleasant St
CR EE K
20th St
19th St
0
Arapahoe Av
t
Gregory Cree k
54 8 0
l
t
Goss St
t
S 11th 10th
University Av
9th St
CREEK-I NT
P 24th
St
S 23rd
22nd 21st St
Goss St
Boulder Cree k
Grand View Av
5440
Dean Pl
56 80
Hapgood St
Marine St
Pl
Di tc h
ln Linco
sio n
Jay St
5720
Walnut S t
Athens St
8th St
xte n
t 8th S
on E
19th St
S 15th
S 13th
Grove St
ln Pl
7th St
ers
Goss St
Arapahoe Av
Linco
6th St
5th St
K-INT CREE
An d
t 18th St
Bv
t
t
4th St
5400
55 20
S 19th
t
on Cany
t 5th S
4th S
Arapahoe Av
e St
t
S 15th t
t
S 10th
t 9th S
t 8th S
t 7th S
t 5th S
t 4th S
CREEK
Marine St 5560
St
LATER AL
W Ln
c Spru
St
Boulder & Lefthand Ditch
S 14th
l Pear
S 11th
View R d
t
a
e ho
3rd S
p Ara
oe Av
St
St
t
Dr
H TC DI
l Pear t C on Beac
S 10th
od
Ditch
0 56 8
c Spru
t ce S Spru
e St
St 21st
t
t
S 17th
S 16th
t
t 8th S
o llw
ke Silver La
Mounta in
H DITC
South
ut Waln
r D
o Kn
k oc R
6th St
n
5th St
e re G
56 40
Arapa h
dway Broa
7th St
5520
Highland Av
S 18th
S 15th
CREEK-INT
Mapleton Av
t
v
St
n
St 21st
55 20
Dr Mesa
S 26th
DITC H
Alpine Av
S 18th
11th St
10th St
7th St
56 00
5760
a Portl
et B Suns
d Pl
Maxwell Av
Maxwell Av
Panorama Av
S 24th
54 00
Portland Pl
Concord Av NEIGHBORHOODS
54 00
22nd
Dewey Av
11th St
10th St
4th St
North St
Alpine Dr
19th
DITCH
58 00
17th St
North St
15th St
Alpine Av
Farmers Ditch
5th St
8th St
4th St
h St
th St
5th St
Alpine Av
INT
5640
58 00
5680 5720
EKCRE
Valley View Dr
Tyler Rd
Legend
Pennsylvania Av
Streets
Colorado Av
Streams_usgs Hydrology_Line
500-Year Flood Plain Parks & Open Space
Neighborhoods
Wardenburg Dr 0
250
500
Central Boulder 1,000 Feet
Willard Loop Dr
Colorado University Crossroads
Regent Dr
CREE K
15th St
60 0 0
Rd Flagsta ff
61 20 60 80
Buildings
Baker Dr
Cockerell Dr
62 00
Hydrology_Lakes
Euclid Av
16th St
63 20
Lakes_usgs
Engineering Dr
Libby Dr
18th St
14th St
10th St
Euclid Av
13th St
12th St
11th St
College Av
Grant Pl
r ll D Hi
8th St
INT
se Ro Av Euclid
6th St
5600
CRE EK-
Gilbert St
63 60 64 00
57 60
58 40
6160
62 80
5480
Lincoln Pl
60 40
40 62
Contour Lines
Jay St
58 00 59 20 58 80
5960
St Balsa m
22
t
St Pin e
S 20th
S Pine
Boulder & W hiterock Ditch
High St
t
St
n Av
t
11th St
t
t
7th St
Gregory Cree k
0
CREEK
A
22nd St
Vehicular_Bridges
Colorado Av
Streets Streams_usgs
Baker Dr
Hydrology_Line Contour Lines
Euclid Av
Hydrology_Lakes
Wardenburg Dr 16th S
0
250
500
Buildings 1,000 Feet
500-Year Flood Plain Parks & Open Space
Willard Loop Dr
Engineering Dr
Major Roads
Cockerell Dr
14th St
Euclid Av
Libby Dr
18th St
College Av
15th St
54 8 0
19th St
21st St
University Heights
5360
Macky Dr
CR EE K
Taft Dr
Stadium Footbridge
13th St
CREE K
24th Street (Folsum
Legend
12th St
60 0 0
15th St
13th St
CREEK-I NT
20th St
19th Street Footbridge
Hillside Rd
Pennsylvania Av
11th St
Rd
Arapahoe Av Arapahoe Av
FootBridge-Location
College Av
10th St
Flagsta ff
Folsom St
22nd St
5320
19th St
18th St
St
61 20 60 80
Folsom St
21st St
19th St
Grove St
Colorado Av
Lincoln Pl
62 00
l
t
t Grove St
t DITCH
9th St 9th St
63 20
P 24th
St
S 23rd
22nd
S 19th
18th St
17th St
S 11th 10th
Boulder Cree k
Pleasant St
Grant Pl
8th St
INT
se Ro Euclid Av
6th S
5600
Gilbert St
57 60
58 40
d fR taf gs Fla
6160
CRE EK-
University Av University Av
5480
r ll D Hi
Goss St
Arapahoe Av
Marine St
17th Street Bridge Grand View Av
Pl
Jay St
58 00 59 20 58 80
ln Linco
56 80
Hapgood St
High School Footbridge
5440
Dean Pl
Jay St
5720
Di tc h
Goss St
Pl
sio n
St
Athens St
8th St
xte n
t 8th S
on E
ln Linco
7th St
5th St
ers
Goss St
t
t
6th St
4th St
5400
Walnut S t
Boulder & Lefthand Ditch
Grove St
Arapahoe Av
9th Street Bridge
St 21st
t
S 15th
City Hall Footbridge
e St
t
t S 13th
t
t
Arapahoe Av
South
S 14th
Bv
t
v on B Cany
St 20th
S 18th
t
t
St
t on Cany
Boulder Public Library
CREEK
nW eL
S 17th
S 16th
S 15th
dway Broa
S 11th
S 10th
t 9th S
t 5th S
4th S
3rd S
K-INT CREE 63 60 64 00
St
ut Waln
l St Pear ut St Waln
LATER AL
An d
5960
l Pear
t 8th S
t 7th S
t 5th S
t 4th S
l St Pear
St 11th
t
Dr
l St Pear
e St
55 20
5560
S 10th
od
o ah
t
View R d
Marine St
62 80
St 15th
t 8th S
o llw
Ditch
H TC DI
p Ara
oe Av
40 62
t ce S Spru
r D
o Kn
k oc R
6th St
n
5th St
e re G
ke Silver La
0 56 8
c Spru
l St Pear t on C Beac
60 40
t
dway Broa
7th St
5520
56 40
Mounta in
ce S Spru
Sixth Street Bridge Arapa h
S 15th
9th St
CREEK-INT
Highland Av
H DITC
c Spru
Regent Dr
10th St
to Maple
t
t Bv S 18th
an Portl
e Suns
d Pl
Maxwell Av
Mapleton Av Mapleton Av
S 26th
St
S Bluff
S 24th
54 00
Portland Pl
7th St
56 00
5760
55 20
Dr Mesa
22nd
DITC H
Panorama Av
54 00
Alpine Av
19th
DITCH
58 00
Alpine Dr
St 21st
10th St
4th St
North St
11th St
Farmers Ditch
Alpine Av
Dewey Av
FOOT AND Concord Av VEHICULAR BRIDGES Maxwell Av
7th St
8th St
5th St
North St
5th St
th St
St
St
5th St
Alpine Av
INT
5640
58 00
5680 5720
EKCRE
Valley View Dr
Tyler Rd
St Balsa m
22
A
19th St
Boulder & W hiterock Ditch
22nd St
Colorado Av
Legend
21st St
Contour Lines Hydrology_Lakes
Wardenburg Dr 16th St
0
250
500
Buildings 1,000 Feet
500-Year Flood Plain Parks & Open Space
Willard Loop Dr
Regent Dr
Hydrology_Line
Engineering Dr
Streams_usgs
Baker Dr
Cockerell Dr
14th St
Euclid Av
Major Roads Streets
Euclid Av 15th St
55 20
54 8 0
19th
DITCH
58 00
DITC H
St
CREEK
Gregory Cree k
0
7th St
CR EE K
University Heights
Libby Dr
18th St
College Av 13th St
12th St
CREE K
Taft Dr
5360
Macky Dr
CREEK
Stadium D r
Pennsylvania Av
11th St
60 0 0
20th St
19th St
18th St
17th St
Marine St
Arapahoe Av Arapahoe Av
NAROPA University Married Student Housing
Hillside Rd
15th St
13th St
CREEK-I NT
t
Arapahoe Av
Folsom St
Grove St
22nd St
5320
Grove St
Installation_Locations
College Av
10th St
Rd
Folsom St
21st St
19th St
18th St
S 15th
Goss St
Colorado Av
Lincoln Pl
Flagsta ff
l
t
t
St DITCH
9th St 9th St
61 20 60 80
P 24th
St
S 23rd
22nd
St 21st
St 20th
t
S 15th
Goss St
t
Pl
62 00
t
t
t
S 19th
t
St 15th t
t
S 11th
10th
ln Linco
63 20
S 26th
S 24th
St
St 21st
S 20th
t S 17th
t
St
Boulder Cree k
Grand View Av
Pleasant St
Grant Pl
8th St
INT
6th St
5600
Gilbert St
57 60
58 40
d fR taf gs Fla
6160
CRE EK-
se Ro Euclid Av
r ll D Hi
Goss St
Grove St
Boulder High School
University Av University Av
5480
e St
Walnut S t
Boulder & Lefthand Ditch
ln Pl
Jay St
58 00 59 20 58 80
BMOCA
H DITC
c Spru
Athens St
8th St
56 80
Hapgood St
t
South
St
5440
Dean Pl
Jay St
Di tch
Boulder Public Library
t 8th S
7th St
sio n
ut Waln
Central Park Arapahoe Av Boulder Municipal Campus Linco
6th St 6th St
5th St
xte n
5720
S 13th
t
on E
S Bluff
ut St Waln
S 14th
t
t
t 5th S
4th S
t
4th St
K-INT CREE
ers
dway Broa
S 11th
S 10th
t 9th S
t 8th S
t 7th S
t 5th S
t 4th S 3rd S
Highland School
5400
An d
St 11th
t
t 8th S
Dr
Arapahoe Av
55 20
5960
Bv o nMunicipal Cany
LATER AL
Park
Marine St 5560
S 10th
od
CREEK
nW eL
l St Pear
17th & Canyon 13th bet Walnut & Canyon Boulder One v Plaza B on Cany Broadway & Canyon
Center
Justice Center
S 16th
t
r D
o llw
H TC DI
o ah
l St Pear
t
S 18th
S 15th
dway Broa
t ce S Spru
9th & Pearl Boulder One Plaza
n Av
t
St Pin e
9th St
k oc R
o Kn Ditch
0 56 8
e St
Dr Mesa
S 18th
High St
6th St
n
5th St
e re G
ke Silver La
View R d
54 00
Alpine Av
to Maple
S Pine
St
Alpine Dr
22nd
t Bv
Maxwell Av
ce Spru
l St Pear
7th St
e Suns
l nd P
7th St
5520
56 40
p Ara
62 80
a Portl
11th St
10th St
7th St
CREEK-INT
Mounta in c Spru
oe Av
40 62
11th St
10th St
4th St
56 00
5760
Highland Av
l St Pear t on C Beac
60 40
54 00
Portland Pl
Mapleton Av Mapleton Av
Arapa h
63 60 64 00
North St
Dewey Av
Concord Av PROJECT LOCATION Maxwell Av
5th St
North St
Alpine Av
Farmers Ditch
5th St
8th St
h St
St
St
th St
Alpine Av
INT
5640
58 00
5680 5720
EKCRE
Valley View Dr
Tyler Rd
Boulder & W hiterock Ditch
23rd St
19th St
22nd St
University Heights
A
Colorado Av
Libby Dr
Historic_Photos
13th St
Major Roads Streets
Baker Dr
Streams_usgs
Cockerell Dr
14th St
Euclid Av
Hydrology_Line
Euclid Av
Contour Lines
Wardenburg Dr 16th St
0
250
500
Hydrology_Lakes 1,000 Feet
Buildings Parks & Open Space
Willard Loop Dr
Engineering Dr
College Av
18th St
College Av
Regent Dr
CREEK
Gregory Cree k
21st St
55 20
Balsa m
St
Taft Dr
5360
Macky Dr
CREEK
Arapahoe Av
Stadium D r
15th St
58 0
DITC H
19th
DITCH 7th St
20th St
19th St
18th St
17th St
CR EE K
Arapahoe Av
Hillside Rd
15th St
13th St
CREE K
Goss St
Grove St
Grove St
t
0
Goss St
Folsom St
23rd St
21st St
Goss St 5320
S 15th
18th St
19th St
X-11873
X-11872
Legend
12th St
60 0 0
Folsom St
t
54 8 0
t
t
St
Boulder & Lefthand Ditch
t
CREEK-I NT
l
Walnut S t
Pennsylvania Av
11th St
Rd
P 24th
St
S 23rd
22nd
St 21st
St 20th
S 19th
South
Colorado Av
10th St
Flagsta ff
t
t
S 15th
t S 13th
t
61 20 60 80
e St
t
St 15th S 14th
S 11th DITCH
Lincoln Pl
62 00
t
S 20th
S 18th
t
S 17th
S 16th
t
dway Broa St
63 20
S 26th
t
St
S 24th
22nd
St 21st
t
H DITC
c Spru
Boulder Cree k
Grand View Av
Pleasant St
Grant Pl
se Ro Euclid Av
r ll D Hi
8th St
INT
w Av nd Vie
University Av University Av
5480
6th St
5600
Gilbert St
57 60
58 40
d fR taf gs Fla
6160
CRE EK-
10th
Jay St
58 00 59 20 58 80
t
Athens St
9th St 9th St
56 80
Hapgood St
S Bluff
Arapahoe Av
5440
Dean Pl
Jay St
5720
Di tc h
Gra
n Av
Grove St
Arapahoe Av
8th St
sio n
X-11876
Bv
X-11874
X-11866 X-11865
t 8th S
xte n
X-11870
ln Pl
7th St
5th St
on E
v on B Cany
Linco
6th St 6th St
4th St
K-INT CREE
ers
on Cany
t
l St Pear
X-11875
5400
An d
St
t
t
t
Arapahoe Av
Dr Mesa
ut St Waln
t
t 5th S
4th S
3rd S
CREEK
S 10th
t 9th S
t 8th S
t 7th S
t 5th S
t 4th S
H TC DI
X-11868 LATER AL
55 20
5960
St
ut Waln
S 11th
e St
nW eL
St 11th
t
Dr
earl l St P Pear
Marine St 5560
S 10th
od
View R d
Alpine Av
S 18th
S 15th
dway Broa
t ce S Spru
t 8th S
o llw
Ditch
0 56 8
ho
t
0
Alpine Dr
to Maple
S Pine
St Pin e
r D
o Kn
k oc R
6th St
n
5th St
e re G
ke Silver La
ce S Spru
l St Pear
v
High St
7th St
5520
56 40
oe Av
62 80
n
9th St
CREEK-INT
c Spru
h St
10th St
7th St
56 00
5760
Mounta in
pa Ara
40 62
a Portl
et B Suns
d Pl
Maxwell Av
Maxwell Av
Highland Av
l St Pear t on C Beac
60 40
54 00
11th St
5720
Concord Av
Mapleton Av Mapleton Av
Arapa h
11th St
10th St
4th St
North St
Portland Pl
X-11867
360 400
Farmers Ditch
5th St
8th St
St
North St
Dewey Av
HISTORIC PHOTOS
h St
St
t
Alpine Av
INT
5680
5640
EKCRE
Valley View Dr
Alpine Av
22n
St Balsa m
Panorama Av
Alpine Av Dr Mesa
t
Boulder & W hiterock Ditch
S 20th
S Pine
t
t
CREEK
Gregory Cree k
23rd St
54 8 0
19th St
22nd St
Hydrology_Lakes Buildings 500-Year Flood Plain
Baker Dr
Geologic Hazard
Cockerell Dr
14th St
Major Hazard
Euclid Av
Moderate Hazard
Wardenburg Dr 16th St
0
250
500
Moderate Constraint 1,000 Feet
Willard Loop Dr
Minor Constraint Parks & Open Space
Engineering Dr
13th St
Euclid Av
Libby Dr
18th St
College Av
Regent Dr
CREEK
21st St
Colorado Av
Hydrology_Line
Natural Landmarks
College Av
15th St
0
7th St
CR EE K
Streets
Contour Lines
12th St
CREE K
5360
Macky Dr
A University Heights Legend
Pennsylvania Av
11th St
60 0 0
Taft Dr
Streams_usgs
10th St
Rd
Arapahoe Av
Stadium D r
Colorado Av
Lincoln Pl
Flagsta ff
20th St
19th St
18th St
17th St
15th St
13th St
CREEK-I NT
Folsom St
22nd St
5320
Grove St
t
t St
61 20 60 80
Folsom St
21st St
19th St
18th St
Grove St
t
S 11th 10th DITCH
9th St 9th St
62 00
l
t
t
t
S 15th
S 13th
Goss St
Hillside Rd
Pleasant St
Grant Pl
63 20
P 24th
S 23rd
St
S 19th
22nd
St 21st
t
St 20th
S 18th S 17th
t
t
t
t
Goss St
Major Roads
8th St
se Ro Euclid Av
r ll D Hi
St
Boulder Cree k
Grand View Av
University Av University Av
5480
6th St
5600
Gilbert St INT
Grand View Av
Pl
Jay St
d
57 60
58 40
fR taf gs Fla
6160
CRE EK-
ln Linco
56 80
Hapgood St
58 00 59 20 58 80
Goss St
Arapahoe Av
5440
Dean Pl
Jay St
5720
Di tch
Walnut S t
Boulder & Lefthand Ditch
ln Pl
sio n
e St
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6th St 6th St
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St
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11th St
10th St
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S 26th
St
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7th St
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17th St
11th St
North St 10th St
4th St
56 00
5760
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Alpine Av
Farmers Ditch
8th St
5th St
North St
15th St
4th St
St
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5th St
Alpine Av
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22nd
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Portland Pl
High St
t
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S 20th
S Pine
Maxwell Av
Maxwell Av
Alpine Dr
S 26th
11th St
10th St
5640
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4th St
North St
Dewey Av
STREAMS
17th St
Alpine Av
North St
Concord Av
15th St
5th St
8th St
14th St
h St
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5th St
Alpine Av
Valley View Dr
Tyler Rd
t
l
22nd St
Ln
19th St
St
Folsom St
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23rd St
21st St
Goss St
Goss St
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Grove St
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7th St
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19th St
18th St
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Grand View Av
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9th St
Dean Pl
56 80
Hapgood St
Taft Dr
5360
Macky Dr
8th St
Pleasant St 5440
Jay St
Marshall St
5th St
University Av
Hillside Rd
15th St
d Gran
13th St
t 8th S
7th St
55 20
5720
Goss St
Grove St
Arapahoe Av
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South
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18th St
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Bv
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S 14th
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S 10th
t 9th S
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60 0 0
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Baker Dr
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Euclid Av
Silver Lake Ditch Streets
Wardenburg Dr 16th St
62 00
Boulder Creek
0
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14th St
63 20
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18th St
13th St
12th St
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10th St
Grant Pl
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8th St
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6th St
5600
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57 60
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11th St
College Av
Regent Dr
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5480
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5960
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7th St
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19th
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54 00
22nd
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11th St
10th St
5640
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4th St
North St
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Alpine Av
North St
Concord Av
15th St
5th St
8th St
14th St
h St
6th St
5th St
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19th St
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15th St
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10th St
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13th St
12th St
11th St
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60 0 0
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13th St
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Pl
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6th St
5600
Gilbert St
61 20 60 80
22nd St
20th St
19th St
10th
ln Linco
t 8th S
Jay St
62 00
23rd St
21st St
5320
t
Arapahoe Av
t
ln Pl
t 8th S
7th St
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Jay St
57 60
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Grove St
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5480
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Goss St
Athens St
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Ln
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t
S 13th
S 11th
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5th St
Marshall St
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St
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Grove St
5440
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t
t 5th S
t
4th St
5400
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t 8th S
t 7th S
t 5th S
4th S
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t
W Ln
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5960
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Arapahoe Av
Marine St 5560
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Dr
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St
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n
5th St
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56 40
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5520
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S 18th
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in Sunsh
HAZARDS Information about each of the following floodwater hazards to be revealed in detail through GIS
EVENTS THAT CAUSE FLOODS HIGH RAINFALL OVER A SHORT PERIOD OF TIME FOREST FIRES CHANGE WATER ABSORPTION CHARACTERISTICS IN WATERSHED BARKER DAM FAILURE COMBINED EVENTS (SPRING FLOW PLUS THUNDERSTORMS)
BIG THOMPSON FLOOD 20 INCHES OF RAIN FELL IN ONE NIGHT IN THE SUMMER OF 1976 IN THE BIG THOMPSON RIVER CANYON NORTH OF BOULDER. MAXIMUM DEPTH OF THE FLOODWATERS WAS 20 FEET AND DISCHARGE WAS ABOUT 39,000 CFS. 139 PEOPLE DIED DURING THIS FLOOD.
SIGNS AROUND THE COUNTY READ: “CLIMB TO SAFETY IN CASE OF A FLASH FLOOD.” THESE WERE INSTALLED AFTER THE BIG THOMPSON FLOOD BECAUSE MANY PEOPLE WERE KILLED DRIVING THEIR CARS TRYING TO DRIVE OUT AHEAD OF THE FLOODWATERS
LIVING IN OR NEAR THE FOOTHILLS OF THE ROCKY MOUNTAINS MAKES FLASH FLOODS AN EXTREMELY SERIOUS CONCERN. IT IS NOT A MATTER OF “IF” A MAJOR FLOOD WILL HAPPEN, BUT RATHER WHEN
THE TERMS “10 YEAR”, “50 YEAR”, “100 YEAR”, AND “500 YEAR” FLOODS ARE USED TO DESCRIBE THE ESTIMATED PROBABILITY OF A FLOOD HAPPENING IN ANY GIVEN YEAR. THEIR PRIMARY USE IS FOR DETERMINING FLOOD INSURANCE RATES IN FLOOD HAZARD AREAS. USING HISTORIC WEATHER AND HYDROGRAPHIC DATA, EXPERTS DERIVE THE ESTIMATED RATE OF FLOW OR DISCHARGE OF A RIVER OR CREEK. A “10 YEAR” FLOOD HAS A 10% PROBABILITY OF OCCURING IN ANY GIVEN YEAR, A “50 YEAR” EVENT A 2% PROBABILITY, A “100 YEAR” EVENT A 1% PROBABILITY, AND A “500 YEAR” EVENT A .2% PROBABILITY. WHILE UNLIKELY, IT IS POSSIBLE TO HAVE TWO OR 100 OR EVEN 500 YEAR FLOODS WITHIN YEARS OF EACH OTHER
COLLAPSING ROADS, RIVERBANKS, BRIDGES ELECTROCUTION HYPOTHERMIA WHY IS BOULDER PRONE TO FLOODS? THE CITY IS AT THE MOUTH OF A NARROW CANYON. IT IS SUSCEPTIBLE TO FLASH FLOODS BECAUSE OF THUNDERSTORMS, STEEP SLOPES AND RELATIVELY IMPERMEABLE SOILS
EROSION / LANDSLIDES IN A 100 YEAR FLOOD WATER WOULD BE 1/2 MILE WIDE EAST OF BROADWAY
FOOT BRIDGES BREAK AWAY IN HIGH WATER CONDITIONS
DURING A MAJOR FLOOD DEBRIS CAN PARTIALLY BLOCK THE FLOW OF WATER UNDER BRIDGES, CREATING SMALL DAMS. BREAK AWAY BRIDGES CAN REDUCE THIS HAZARD
IN A 100 YEAR FLOOD, WATER WOULD BE 1/2 MILE WIDE EAST OF BROADWAY 4 - 5 INCHES OF RAINFALL IN A THUNDERSTORM CAN CAUSE WATER TO RISE RAPIDLY TO A 14 FT DEPTH, REFERRED TO AS A “WALL OF WATER”. THIS COULD REACH THE CITY OF BOULDER IN 45 MINUTES. THE DEPTH OF WATER DECREASEES AS IT LEAVES THE MOUTH OF THE CANYON AND SPREADS OUT
A CAR FLOATS IN 18 INCHES OF WATER
BARKER DAM
BAR
KE R
DAM BURST STUDY
CATASTROPHIC COLLAPSE OF BARKER DAM. HYDROLOGICAL MODELS ESTIMATE THAT WATER WOULD REACH BOULDER IN ABOUT 35 MINUTES WITH A DISCHARGE OF ABOUT 703,000 CFS AT MOUTH OF BOULDER CANYON. THE CREST OF THE FLOOD WATER WOULD BE 100 FT DEEP.
CONNECT THE DOTS: MAPPING THE HIGH WATER, HAZARDS AND HISTORY OF BOULDER CREEK was done with the collaboration of geologist Peter W. Birkeland, University of Colorado at Boulder and hydrologist Sheila Murphy, US Geological Survey, assisted by Charles Cross and Phanat Sonemangkhala. The temporary installation for the exhibition was organized by Jonathan Fierer, and helped by volunteers. The artist would like to recognize the following sources: Boulder Area Sustainability Information Network; Boulder Creek Flood Notebook; Boulder County Government; Boulder Magazine; Daily Camera; Carnegie Branch of the Boulder Public Library; City of Boulder; Denver Public Library; Denver Regional Council of Governments; Dr. Spenser Havlick; ESRI – Ester Worker, Director of Education Programs; Gilbert F. White Papers on Boulder Creek Floodplain History; South Boulder Creek Mapping Study; University of Colorado at Boulder; and the US Geological Survey.
This project can be found on www.marymiss.com
We would like to thank the following individuals for their assistance: Marda Kirn; Kirsten Gerdes and Joan Markowitz, Boulder Museum of Contemporary Art; Alice Guthrie and Lisa Green, Boulder Parks and Recreation; Cristina Martinez, Boulder Department of City Planning, Jacob Morgan (GIS), Greg Tucker, University of Colorado (surveying)
(news) This project was done for an exhibition curated by Lucy Lippard “Weather Report: Art and Climate Change” at the Boulder Museum of Contemporary Art in collaboration with EcoArts, Boulder, Colorado, 2007.