Located in Santa Rosa, California, Annadel No. 1 is a state-regulated earth dam designed for water supply purposes. Completed in 1956, this dam on Spring Creek has a height of 67 feet and a storage capacity of 395 acre-feet. With a drainage area of 1.71 square miles, the dam serves as a crucial water source for the surrounding area, providing both recreational opportunities and essential water supply.

Despite being classified as having a high hazard potential, Annadel No. 1 is currently in fair condition, as assessed in March 2022. The dam is regularly inspected by state regulatory agencies and has a designated Emergency Action Plan (EAP) in place. While the dam's risk assessment and management measures are not explicitly outlined in the data, its compliance with state permitting, inspection, and enforcement requirements indicates a commitment to safety and operational efficiency.

As a key component of the water infrastructure in Sonoma County, Annadel No. 1 plays a vital role in managing water resources and supporting the local ecosystem. With its strategic location and significant storage capacity, this earth dam stands as a testament to California's ongoing efforts to ensure water security and resilience in the face of changing climate conditions.