Tri-State Steelheaders completed construction of fish passage improvements in 1,050 feet of the Mill Creek flood control concrete flume, beginning at the 9th street bridge and extending upstream to just upstream of the 6th Ave bridge in Walla Walla. The project site connects with 200 feet of similar fish passage improvements completed in 2011 (09-1587). Final designs and specs were developed in project 12-1634. The concrete channel was modified by adding roughness to reduce water velocity and by adding fish resting pools. 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 (06-2203) 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. This project is one of a series that are necessary to fully restore fish passage through the flood control project. 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. This project was awarded $461,860 of federal SRFB funds and $81,860 of match in 2013 to treat 535 feet of channel. An additional $404,953 of state SRFB funds, $61,020 of federal SRFB funds, and $82,231 of match were added in 2014 to increase the project scope from 535 feet to 1000 feet of treated channel. The final treated length of channel was 1,050 feet.