Yucaipa No. 1, located in Yucaipa, California, is a crucial water supply dam completed in 1978 to serve the community's needs. This earth dam stands at a height of 42 feet, with a hydraulic height of 34.5 feet, and a length of 420 feet, providing a maximum storage capacity of 92 acre-feet. The dam is owned and regulated by the state, ensuring that it meets safety standards through regular inspections and enforcement measures.

Despite its high hazard potential, Yucaipa No. 1 has been assessed as satisfactory in condition, with the last inspection conducted in February 2020. The dam's Emergency Action Plan (EAP) is being continually updated, with the most recent revision in October 2019. The dam's primary purpose is water supply, with additional recreational benefits for the community. With a drainage area of 0.36 square miles and a surface area of 8 acres, Yucaipa No. 1 plays a vital role in managing water resources in the region.

Situated along the Tr Yucaipa Creek, Yucaipa No. 1 serves as a crucial infrastructure for water management in San Bernardino County. With its strategic location and essential role in providing water supply for the area, this dam underscores the importance of sustainable water resource management and climate resilience in the face of evolving environmental challenges.