Longley, also known as McGee Lake, is a privately owned dam located in Bishop, California. Built in 1910, this earth dam stands at a height of 27 feet and serves primarily for hydroelectric power generation and recreation purposes. It has a storage capacity of 178 acre-feet and covers a surface area of 11 acres, with a maximum discharge capacity of 300 cubic feet per second.

Managed by the Federal Energy Regulatory Commission, Longley is regulated and inspected to ensure its safety and compliance with state standards. Despite being classified as having a low hazard potential, the dam is subject to regular inspections and emergency action plans to mitigate any risks. With a moderate risk assessment rating, Longley plays a crucial role in water resource management and climate resilience efforts in the region.

The dam's location on McGee Creek in Inyo County, California, highlights its importance in providing water resources and recreational opportunities for the local community. With a history dating back over a century, Longley stands as a testament to the ingenuity of early hydroelectric infrastructure projects and continues to play a vital role in supporting sustainable water management practices in the area.