Green Valley Lake, located in Running Springs, California, is a private multi-arch dam built in 1925 for water supply purposes. The dam stands at a height of 56 feet with a hydraulic height of 53 feet, spanning 425 feet in length. With a storage capacity of 250 acre-feet and a surface area of 22 acres, the dam serves as both a recreational area and a vital water source for the region.

Managed by the California Department of Water Resources, Green Valley Lake is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. Despite its low hazard potential and satisfactory condition assessment, the dam undergoes regular inspections to mitigate any risks. The surrounding Green Valley Creek and its drainage area of 1.2 square miles contribute to the dam's importance in maintaining water supply and flood control in the area.

With its historical significance and critical role in water management, Green Valley Lake is a valuable asset in San Bernardino County, California. Climate and water resource enthusiasts can appreciate the engineering and environmental efforts put into maintaining this essential infrastructure for both human and natural ecosystems.