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Posted 5/21/2013

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By Diana Fredlund
Public Affairs

The Corps of Engineers is developing a long-term sediment management plan to reduce the amount of sediment depositing in the lower Cowlitz River. The plan’s purpose is to maintain flood risk protection at specified levels for the cities of Castle Rock, Lexington, Kelso and Longview, Wash.


Scoping is the initial stage of the environmental impact statement process used to identify issues, alternatives, and impacts to be addressed in the National Environmental Policy Act analysis. The Corps is proposing four alternative plans for managing long-term sediment management and we are asking the public for input on them:

  1. One-time raise of Sediment Retention System and spillway by between 40 and 50 feet.
  2. Annual dredging of the lower 20 miles of Cowlitz River.
  3. Adaptive approach that would include combination of additional raises of SRS Spillway (up to 23 feet), construction of small scale structures upstream of SRS (similar to grade-building pilot project effort), and infrequent dredging in the lower Cowlitz River, if large events occur.
  4. No action. This alternative is required under the NEPA process.

We are asking the public to consider the following questions as they write their comments about our four alternatives:

    A) Is the geographic area to be analyzed in the SEIS sufficient to capture potential effects from the proposed alternatives?

    B) Have all potentially affected resources and the extent of analysis for those resources been identified?

    C) Do you know of resources that may be adversely impacted by the proposed alternatives?

    D) What specific measures do you recommend the Corps consider to avoid, minimize and mitigate effects of our proposals?