A geomorphic assessment was conducted in May of 2010 on the Walla Walla River downstream from the Frog Hollow Road Bridge, Mill Creek downstream of the Wickersham Bridge, and Coppei Creek downstream of McCown Road. The focus of the assessment was channel, vegetation, and floodplain conditions. Surveys were completed for channel and floodplain conditions, large woody debris, riparian conditions, bank stability, and streambed sediment. Recommendations have been provided on channel restoration for the assessment reaches to address unstable areas.
The full report is linked here: Walla Walla, Mill Creek, and Coppei Geomorphic Assessment.