Donnells Dam, located in Sonora, California, on the Middle Fork Stanislaus River, is a concrete structure designed by the George E. Goodall Co. and completed in 1958. It serves primarily for hydroelectric purposes, with a dam height of 317 feet and a storage capacity of 65,000 acre-feet. The dam has a controlled spillway with a width of 175 feet and five Tainter (radial) outlet gates.

Managed by the Federal Energy Regulatory Commission (FERC), Donnells Dam is regulated and inspected to ensure its safety and functionality. With a high hazard potential and a very high risk assessment rating, the dam is closely monitored for any potential risks or hazards. While the condition assessment is currently not available, emergency action plans are in place, and the dam meets regulatory guidelines for safety and operation.

As a key structure in flood risk reduction and hydroelectric power generation, Donnells Dam plays a crucial role in water resource management in the area. Its strategic location in Tuolumne County, California, highlights its importance in ensuring water supply and energy generation for the region. With its impressive design and critical functions, Donnells Dam continues to be a focal point for water resource and climate enthusiasts interested in sustainable infrastructure and environmental stewardship.