Tri-State Steelheaders completed final designs for passage improvements in a 1,280 foot long section of concrete flume on Mill Creek between 9th Ave and 5th Ave in Walla Walla. They also completed conceptual designs for passage at the 6th Ave and 5th Ave bridge piers. Flood control measures on Mill Creek include a concrete channel that extends over two miles through Walla Walla. The Mill Creek Barrier Assessment completed in 2009 identified and described barriers for ESA listed steelhead and bull trout, and for reintroduced spring Chinook. Returning adults encounter flow dependent depth and velocity barriers, and a lack of resting opportunities. Juvenile fish encounter low spring flows and high water temperatures in late spring. Often by mid-May, adults and juveniles become trapped in the flood control channel where they experience lethal temperatures. Many of these passage issues are considered imminent threats in the Snake River Salmon Recovery Plan. Mill Creek, upstream of the flood control project, is a critical and under-utilized area for spawning and rearing of ESA listed species. It provides for an important recovery opportunity for those listed fish as well as good habitat for other native fish and reintroduction efforts for spring Chinook. The project is near the downstream end of the concrete channel, and is continuous with the 9th Avenue Flume Transition project (09-1587), completed in 2011.