To offer a suggestion or report an error on the King County flooding services and information website, please contact Fred Bentler, webmaster.
The following documents describe many project details and design needs. These documents were developed for the County Council approval process, which was completed in July of 2002. (Adobe Acrobat).
1. Transmittal Letter from Executive Sims to council
2. WLRD Presentation to council in support of Executive proposal (2.8 Mb)
4. Council Motion (project approval)
The Corps of Engineers and the City of Snoqualmie have entered agreements with King County that specify agency roles and responsibilities for completion of this project. Following are those agency agreements:
All of the required permits were approved and the Corps advertised the project in two seperate construction contracts to prospective bidders. The first contract was for channel excavation and the second was for bridge removal. Following is an excerpt of selected plan sheets in .pdf format, as well as links for the complete solicitation on the Corps website.
1. Selected plan sheets (3.0 Mb)
2. Corps solicitation for channel excavation contractor (removed 12/09)
3. Corps solicitation for bridge removal contractor (removed 12/09)
The project was expected to reduce the depth and frequency of flooding in Snoqualmie, where more than 600 homes and most of the commercial area were subject to severe flood damages. The Corps estimated that the project will prevent more than half of the economic damages caused by that flood problem, with an average annual savings of $837,000. Total project cost is estimated at $7.65 million, of which the Corps funded $4.40 million (58%).
Because the project moved flood water through the Snoqualmie area more readily, it may have had a small adverse impact on downstream flood problems. This relationship was studied in detail by the Corps of Engineers. Their calculations showed that downstream flooding could become as much as 0.1 foot deeper at the peak of a 100-year flood. Impacts would be smaller during lesser (more frequent) floods, and would diminish with distance from Snoqualmie. Still, this adverse impact is enough that the project included a Downstream Assistance Program (DAP) to help address flood problems where this impact would occur.
The Snoqualmie Flood Reduction Project was proposed by the U.S. Army Corps of Engineers. King County and the City of Snoqualmie shared the local sponsorship responsibilities for this Corps of Engineers project.