Willow Hill Reservoir, located in Folsom, California, is a vital water supply facility owned by the local government. This reservoir is regulated by the Department of Water Resources (DWR) and falls under the jurisdiction of the state, ensuring proper permitting, inspection, and enforcement protocols are in place. With a primary purpose of water supply, Willow Hill Reservoir serves multiple uses including irrigation and tailings management.

This Earth-type dam stands at a height of 24 feet and has a hydraulic height of 20 feet, with a storage capacity of 125 acre-feet. The reservoir covers a surface area of 13 acres and has a drainage area of 0.06 square miles, offering a crucial water source for the region. Despite being classified as having a high hazard potential, Willow Hill Reservoir is currently assessed to be in fair condition as of September 2017, with regular inspections and emergency action plans in place to ensure the safety and functionality of the structure.

With its strategic location along the Tr American River, Willow Hill Reservoir plays a key role in water resource management in Sacramento County. As climate change continues to impact water availability and quality, reservoirs like Willow Hill are essential for ensuring a reliable water supply for agricultural, urban, and industrial needs in the region. Through diligent maintenance and risk management measures, Willow Hill Reservoir stands as a critical infrastructure supporting the community's water security and resilience in the face of changing environmental conditions.