Williams Valley is a privately owned dam located in Dos Rios, Mendocino County, California. Completed in 1965, this earth dam stands at a height of 47 feet and serves primarily for water supply purposes, including irrigation and tailings. With a storage capacity of 200 acre-feet and a drainage area of 1.4 square miles, Williams Valley plays a crucial role in water resource management in the region.

Managed by the California Department of Water Resources (DWR) and regulated by the Safety of Dams agency, Williams Valley has a low hazard potential and is currently in satisfactory condition. The dam undergoes regular inspections, with the last assessment conducted in September 2017. With a hydraulic height of 39 feet and a length of 243 feet, this structure contributes to the sustainable utilization of the Tr Short Creek for various agricultural and domestic water supply needs in the area.

Representing a significant asset for the community, Williams Valley operates under the oversight of state regulatory agencies and ensures compliance with safety standards. The dam's location, in close proximity to the Sacramento District, underscores its strategic importance in water management practices. Climate and water resource enthusiasts will appreciate the vital role that Williams Valley plays in maintaining the water supply infrastructure and supporting sustainable development in the region.