Bonneville Lock & Dam Washington Shore Ladder Entrance Modifications

The Bonneville Lock and Dam is located approximately 145 river miles from the mouth of the Columbia River between Oregon and Washington. An existing fish ladder has provided Chinook and Coho salmon a means around the hydro facility at the dam to their spawning areas upstream. Lamprey, an eel-like fish with no fins, have not been able to navigate the high-velocity passage system at the dam, resulting in declining lamprey numbers. This project modified the fish ladder on the Washington side of the of the dam to accommodate lamprey in an attempt to rebuild the population in habitats upstream.

The scope of the project involved demolishing an existing lamprey flume system, fabricating and installing the new system on the side of the dam and installing a gravity water supply system to feed the new flume. The gravity water supply included 300 feet of welded steel pipeline to provide water to the new flume.

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