U.S. seeks bids for fish passage excavation at Hanson Dam

The Corps of Engineers is calling for proposals for final excavation and tunneling work for a fish passage facility at Howard Hanson Dam, on the Green River in western Washington. Proposals are due Oct. 10.

The facility is being built adjacent to an existing outlet tower and 900-foot-long outlet tunnel at the 230-foot-tall rockfill dam. So far, excavation has progressed from an elevation of 1,150 feet to 1,074 feet. The front section of the facility already has been constructed, and is being used as a cofferdam to keep the excavation separated from the reservoir.

The new work will include excavation to final facility design depth and excavating and constructing an attraction water conduit and a personnel access tunnel. The Corps estimates the cost of the work will be between $5 million and $10 million.

A one-time site visit is scheduled Oct. 5. The point of contact for the visit is Mamie Brouwer, (1) 206-764-3577; E-mail:

Proposals are due Oct. 10 to the Seattle District, Corps of Engineers, P.O. Box 3755, Attn.: CENWS-CT-CB, Seattle, WA 98124-3755. The solicitation, No. W912DW-07-R-0045, and related documents can be found on the Internet site by entering the solicitation number, without hyphens, in the �Quick Search� box. Registration in the Federal Technical Data Solutions (FedTeDS) Internet system is required to obtain some of the documents. Contact Paul Daneker, (1) 206-764-6865; Fax: (1) 206-764-6817; E-mail:

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