TABLE OF CONTENTS
I.
TY PICA L TR A IL S
D.
C o n stru cted El em en ts
A.
T r ail T y p e Diagram
•
Pe de s t r i an Edge Pr ot e c t i on
B .
T y p ic al T r ail Ex ist ing Cond it ions Phot os
•
D r y L ai d R e t ai ni ng W al l
C .
T y p ic al T r ail Det ails
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S t e p s S e t i n G r ade
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Cut Sl ope Di agram
•
S t e p s El e vat e d on Foot i ngs
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Br oad B ase Di p Grad i ng Di agram
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T r ai l He ad
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Pr imary Trail - Preferred
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O ve r l ook
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P ri m ary Trai l - Al ternate / Secondary Tra i l
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V e hi c ul ar G uar d R ai l
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Secondary / Emergency Trail
•
T r ai l R oad C r os s i ngs
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T ert i ary Trai l
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Ex i s t i ng T r ai l C l os ur e
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P ri m ary Trai l L ongi tudi nal
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Second ary Trai l L ongi tudi nal - Type A
•
Second ary Trai l L ongi tudi nal - Type B
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Second ary Trai l L ongi tudi nal - Type C
•
Sw i tchback
II. TR A IL C O M PO N EN T S A . T r ail Sit e P lan
B .
T r ail C o m p onent Ex ist ing Cond it ions Phot o s
C .
W e t C r o s s ings •
Wid e Puncheon - Pref erred
•
E ncapsul at ed Seepage L ayer - Pref erre d
•
F ord / Arm ori ng - Al t ernate
•
Cul vert - Al t ernate
•
Smal l Span B ri d ge
•
Br idge
•
Boardw al k
I I I . P RELI MI NARY QU ANTI TI ES
A. T rail Type Diagram
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1
PHOTO KEY
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3
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2
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B. Typical Trail Existing Conditions
1
Old Bench Trail
2 Old B1 Camp
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3 Edge of C Camps
5 Narrow Jeep Trail
4 Narrow Jeep Trail
6 Wider Jeep Trail
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C. Typical Trail Details
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C. Typical Trail Details
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C. Typical Trail Details
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C. Typical Trail Details
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C. Typical Trail Details
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C. Typical Trail Details
SWITCHBACK
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NOTES: 1. S W ITC H B A C K D E TA IL B Y U S D A - FOREST S E RV IC E 2. R E IN FOR C E IN S ID E C U R B TO P R E V ENT C OR N E R C U TTIN G 3. MANAGE LOCALIZED DRAINAGE TO AV OID TR A IL TR E A D E R OS ION 4. MINOR RETAINING WALLS MAY BE R E QU IR E D B U T N OT N E C E S S A RY, D E P E N D IN G ON S ITE C ON D ITION S
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II. TRAIL COMPONENTS Bechtel Summit National Scout Reserve Design Development - For Pricing Only - Not for Construction
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A. Trail Site Plan
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1
3 2
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B. Trail Component Existing Conditions
1
Steps on Footings
2 Bridge at Barren Branch
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3 Overlook
5 Boardwalk
4 Road Crossing
6 Steps Set in Grade
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C. Wet Crossings Wi de P u n c h e o n - P r e f e r r e d ( S e a so n ally W e t & S m all Channels)
Encapsulated Seepage Layer - Preferred (Tran si ti o n s o n & o f f pu n ch eo n s, bri dges & cu l v e r ts ) Wood deck Kickrail
Rock Retainer Option Stringers elevated slightly above grade (18” max., 6” min.)
Trail tread
Log sill or sleeper - set on compacted aggregate & float base _______ to avoid contact with ground - anchor sill to ground
Wooden Spikes
Geotextile
N o te s :
Notes:
• Higher traffic
• G4 Drainage stone wrapped in geotextile
• Allows for variable flow of water
• Good for high ground water areas
• Less prone to clogging than culverts
• Could be combined with a puncheon, bridge or culvert if area also includes a channel or directional water flow
• Limited footings
Log or Rock Retainer
Overlap
• More intensive construction • Accessible Precedent Images for information only and do not represent exact/final trail design
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C. Wet Crossings Fo rd / A rmo ri n g - Alt e r na t e ( S e a so n ally W e t A r e as )
Cu lv ert - Alt erna t e
N o te s :
Notes:
• Broad flat topped stones over 4” aggregate base & geotextile
• Higher traffic
(Sm al l ch an n el cro ssi n gs)
• More intensive construction
• Allows for variable flow of water
• Prone to clogging & subsequent trail washout
• Can use log or rocks to retain tread
• Higher impact construction than puncheon
• Not necessarily accessible
• Can use rock or timber to enhance appearance
Precedent Images for information only and do not represent exact/final trail design
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C. Wet Crossings Sma l l S pan B ri dge
Bridge
(W i de c h an n e l c r o s s in g s & st reams)
(B arren B ran ch cro ssi n g)
N o te s :
Notes:
• Longer span than puncheon
• Longer span than small bridge
• More intensive construction
• More intensive construction
• Anchor posts required (helical piles or concrete footings)
• Abutments required: concrete with stone facing or stone masonry for visible portions
• Requires handrails or curbs
• Span depends on channel size and flood elevation
• Wood construction or combination wood/steel construction to be discussed
• Requires railing • Wood construction or combination wood/steel construction to be discussed
Precedent Images for information only and do not represent exact/final trail design
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C. Wet Crossings Boa rdwal k (W e t l a n d m itig at io n ar e a c rossings)
N o te s : • Can consider all wood construction or metal grating (with or without wood decking for aesthetics) which would mean fewer footings • Footings could be concrete, helical screws or helical piles (are more portable, sustainable & lower environmental impact than concrete - also require specialized equip. & expertise to install correctly) • Include kick rail curb or railings
Precedent Images for information only and do not represent exact/final trail design
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D. Constructed Elements Pedes tri an E dge Pr ot e c t ion
Dry La id Ret a ining W a ll
N o te s :
Notes:
• Edge protection is a raised curb, wall, railing, or other projecting surface that defines the edge of a travel surface and helps keep people and assistive devices from accidentally falling off the edge.
• Edge delineation
• Edge protection is not required for accessibility on trails. However, edge protection should be provided on a trail where pedestrian safety is a concern. It should be constructed from rocks, designed appropriately for the site and must be at least 3 inches (75 millimeters) high.
• Some locations may require safety measures in the form of additional rock work, guard rails or combination log seating / guard
• Rock source: on site salvage.
• Wider trail section
• Locations:
- as shown on plan
- at some switchbacks
- at new trails where side slopes > 30%
Precedent Images for information only and do not represent exact/final trail design
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D. Constructed Elements Steps S e t In G rade
S t ep s Elev a t ed o n Fo o t ings
N o te s :
Notes:
• Rock steps (rock affords greater longevity)
• Constructed boardwalk
• Set in grade • Overlapping or separated risers depending on slope
on
footings
in
combination
with
• Utilized in locations where grade is steep enough that footings represent less disturbance than cutting into the slope • Wood or metal grate surfaces possible
Precedent Images for information only and do not represent exact/final trail design
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D. Constructed Elements O v erl o o k
Tra ilhea d
N o te s :
Notes:
• Cleared area at selected location, adjacent to trail - allows for site interpretation, resting & passing
• Iconic signage - trail names, destinations, arrows
• Potential seating
• Width - up to 2x trail width or 4 ft. minimum each side
• Potential shelter
• Limited seating - on benches, shaped logs or flat top boulders
• Potential site interpretive signage
• Vehicle deterrent - boulders at selected locations
• Trail map - at selected main trailheads
• Surface - matches trail surface Precedent Images for information only and do not represent exact/final trail design
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• Consider vertical element for visibility
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D. Constructed Elements Vehi cu l ar G u ardrail
Tra il Ro a d Cro ssings
N o te s :
Notes:
• Typical guardrails will be constructed using timber posts and weathering steel rails
• Utilize painted markings where trails cross main road
• Where pedestrian trails meet up with, or run parallel to the main road, it might be desirable to use heavy timber rails to help distinguish the pedestrian zone
• Utilize yield lines and yield signage at the approach to road crossings • Possibly utilize transverse rumble strips or raised paint strips on vehicular approach to signal driver that a crossing is ahead
Precedent Images for information only and do not represent exact/final trail design
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E xi sti ng Trai l C l o su r e
N o te s : • Selected locations • Places cut logs & brush salvaged from trail construction on 1st 50’ of existing trail tread to obscure trail alignment in a naturalistic manner • Locations to be discussed
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III. PRELIMINARY QUANTITIES ELEMENT
QUANTITY
LENGTH
ELEMENT
QUANTITY
LENGTH
Primary Trail
na
53,320
Trail Road Crossings
18
na
Secondary Trail
na
13,140
Trail Wayfinding Locations
45
na
Secondary / Emergency Trail
na
8,025
Existing Trail Closure
na
740
Step Locations
na
2,100
Puncheons
na
800
Retaining Walls
na
500
Bridges
na
400
Trailhead Locations
26
na
Boardwalks
na
1,900
Overlooks
20
na
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(LOCATIONS)
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(FEET)
(LOCATIONS)
(FEET)
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