Completed in 1970, this rolled earth and rock-filled structure is 239 feet high and 1,511 feet long.
The water storage capacity is 226,500 acre-feet which is reserved by court decree for fishery enhancement, primarily for the spawning of the endangered cui-ui, along the Truckee River downstream from Derby Dam and facilities operation of the Pyramid Lake Fishway.
The reservoir provides water primarily for fishery enhancement along the Truckee River and Pyramid Lake Fishway facilities operation. The reservoir also provides flood control, recreation, a reservoir fishery, and other fishery improvements on the main Truckee River, Little Truckee River, and Boca Reservoir.
The dam is owned and operated by Reclamation and is part of the Washoe Project.