CWE developed design plans for a modified diversion system that redirects debris and sediment while allowing flows to be routed to the existing spreading grounds. The project involved hydraulic modeling; Plans, Specifications, and Estimates (PS&Es) development; and permitting support for the development of an improved water diversion system for the Mill Creek spreading basins to reduce and prevent debris from accumulating at the diversion gate. Tasks included: developing project concepts, schematic design drawings, and preliminary cost estimates for three alternative concepts; evaluating the performance and maintenance characteristics of the conceptual alternatives; determining the most cost-effective and maintainable design for the diversion system; analyzing existing conditions for flow depths, velocities, debris accumulation, and long-term channel sedimentation trends; calculating the hydrostatic, hydrodynamic, and debris impact loads for the 5-, 10-, 25-, 50-, and 100-year storms; and identifying required permits.