It is located 13 miles (21 km) southwest of Juntura at an elevation of 3,406 feet (1,038 m).

[2][5][6] It was constructed from 19,500 cubic yards (14,900 m3) of material on top of a series of olivine basalt lava flows.

[3] It has a shore length of about 34.5 miles (55.5 km) and a residence time of about 2.2 years.

[3] Warm Springs Reservoir's watershed covers approximately 1,059.5 square miles (2,744.1 km2) of eastern Oregon.

Bass, bluegill, and rainbow trout are the main fish found in the reservoir.