The Leader February 2011

Page 1

Issue 2

The Leader

February 1, 2011

Northwest Steelhead and Salmon Conservation Society Dedicated to a science-based, ecosystem protection and management approach that integrates the human component on a landscape scale.

In this issue: Proposed Chehalis River Basin Engineered Flood Risk Management Projects Twin Cities Project The Twin Cities Project was conceived by the US Army Corps of Engineers to prevent Interstate 5 from flood-related closures while providing protection for Centralia and Chehalis during 100-year flood events. This project consists of constructing eleven miles of levees and providing 11,000 acre feet of additional storm water retention behind Skookumchuck dam. The Twin Cities Project has been approved and funded by the US Congress with local sponsorship provided by Washington State.

Chehalis River Dam Following the historic 2007 Chehalis River flood, the Lewis County Public Utilities District recommended construction of two hydropower dams in the headwaters of the undammed Chehalis River. An earthen dam resulting in a 40,000 acre foot reservoir was proposed for the South Fork of the Chehalis River.

Location of proposed Chehalis River dam (near Pe Ell)

A second earthen hydropower dam was proposed for the main stem of the Chehalis River, about two miles upstream from the town of Pe Ell. The reservoir behind this dam would retain approximately 268,000 acre feet of water.

Interstate 5 near Centralia closed to all traffic.

Given the escalating costs of the Twin Cities Project, its inability to adequately protect Interstate 5, Centralia and Chehalis, and rising concerns regarding the likelihood of upstream and downstream impacts, the Twin Cities Project is considered throughout the Chehalis River basin to be an ineffective and very costly flood risk management undertaking. 1

Both of these proposed dams are located in prime spawning and rearing habitat for several species of resident and anadromous fish. Although the South Fork dam was recently determined to not be cost effective, the Chehalis River dam has penciled out using Army Corps of Engineers calculations to be cost effective. Interestingly, the benefit to cost ratio does not include impacts to public-owned fish and wildlife.

2011 NWSSCS Annual Meeting and Earth Day Dinner

April 23, 2011


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The Leader February 2011 by Jim Wilcox - Issuu