Glen Martin, also known as Shadow Lake, is a private water supply dam located in Yucaipa, California. Built in 1950, this earth-type dam stands at a height of 55 feet and has a hydraulic height of 49 feet, with a storage capacity of 33 acre-feet. The dam serves the primary purpose of water supply, while also providing opportunities for recreation in the area.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Glen Martin Dam is regulated, permitted, inspected, and enforced by the state authorities to ensure its safety and compliance with regulations. With a fair condition assessment and a high hazard potential, the dam undergoes regular inspections to monitor its structural integrity and mitigate any risks associated with its operation.

Situated on Mountain Home Creek in San Bernardino County, Glen Martin Dam plays a crucial role in water resource management in the region. With its significant storage capacity and strategic location, the dam not only supports water supply needs but also contributes to the overall ecosystem health and recreational activities in the area. Enthusiasts in water resources and climate can appreciate the importance of Glen Martin Dam in sustaining water availability and ecological balance in the region.