The Tri-State Steelheaders used this funding to complete an assessment that identified the location and type of barriers in the flood control channel of Mill Creek in Walla Walla, WA, using hydraulic and energetics modeling. Flow dependent depth and velocity barriers were found throughout the channel. Conceptual designs were developed for limited sections of the channel. A flood control project on Mill Creek in Walla Walla completed in the 1940s includes over six miles of channel either controlled by levees and weirs, or lined with concrete. Above the flood control channel, the upper watershed contains high quality spawning and rearing habitat that is under-utilized by summer steelhead, bull trout, and spring Chinook. Fish managers that poor passage in the flood control channel was responsible for poor spawning and rearing, but there was no definitive information. This project sought to address that information gap. The assessment identified 12 unique channel geometries (reach types), created a hydraulic model based on surveyed channel, and a fish swimming energetics model derived from literature. The results showed that the weir-controlled sections of the channel were a problem at low flow. Depth over the weir was too shallow. In the concrete channel, depth was a problem at low flow. At high flow, velocity was too high, and there were no effective resting areas. Conceptual designs were developed for some of the channel reach types, which were later developed further in a separate design project.