CWE provided hydrologic, hydraulic, and scour analyses for 16 sites along the Metropolitan Water District of Southern California’s Inland Feeder (IF), Upland Feeder (UF), and Rialto Feeder (RF) to support further design of improved facilities. CWE provided initial support on the hydrologic portion of impact assessments to determine which projects required further study. Study objectives were to develop detailed hydrology of the tributary watersheds, determine the existing and proposed hydraulics conditions of the drainage systems in the vicinity of each structure, and scour potential associated with the existing and proposed structures. Existing and proposed conditions were modeled for the 100-year runoff event required by the San Bernardino County Flood Control District (SBCFCD). Tasks included conducting a site investigation and providing photographic documentation, developing hydrologic models, developing existing and proposed conditions hydraulic models, evaluating existing and proposed conditions scour depths, and preparing a drainage report to document study findings.