The Watershed Dynamic Model, a hydrologic model for the Bay Area, can predict flow and sediment for 1994-2024. The model simulates the nine Bay Area counties, with mixed land use types, a wide range of pollutants, upland erosion and sediment transport, and in-stream processes (e.g., bank erosion, settling, and resuspension). The completed model performs well. It can reproduce the timing and peaks of runoff events as well as the annual and year-to-year variation of flow and sediment loads.