Flood measures on Mill Creek at Walla Walla include a levee confined channel, with 263 energy dissipating stabilizers (weirs). The stabilizers span the channel width, creating low flow passage problems. The Tri-State Steelheaders will use funding to complete designs for passage improvements at nine of the stabilizers, and create a low flow channel. These structures were identified as barriers in the Mill Creek Barrier Assessment completed in 2009.   ESA listed steelhead, and bull trout, and reintroduced spring chinook utilize the flood control channel during migrations. 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 as 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, and 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.