The Marrachi/WDFW Irrigation Diversion is located in the Beaver Creek drainage of the Methow Valley Subbasin. Beaver Creek is listed in the Washington Conservation Commission's Limiting Factors Report and the USFS Middle Methow Watershed Assessment as potential habitat for listed Upper Columbia steelhead, Upper Columbia spring Chinook and bull trout. These species presently occupy less than 10% of the potential habitat in Beaver Cr. because of passage barriers created by culverts and impassable irrigation diversion dams. At low flows the Marrachi/WDFW Diversion structure was a barrier to these species. The project objective was to replace this temporary structure with a permanent structure incorporating engineered fish passage and to improve late season flows in Beaver Creek by piping the delivery system.