Jet Flow Gates

Located on the Skokomish River in Mason County, Washington, the Lake Cushman Hydroelectric Project
consists of two dams. River restoration, in-stream flows, fish habitat, fish passage improvements, wildlife habitat, and restoration of fish populations were among the issues addressed by Tacoma Power for the Cushman No. 2 Dam project, originally built in 1930.

Steel-Fab's jet flow gate valve was constructed into the base of the 230' high concrete arch of the Cushman No. 2 Dam. The 65" diameter screw stem actuated jet flow gate automatically adjusts in response to changes in lake water level fluctuations. In less than an hour, the flow from the dam is increased from 60 cu.ft. per second to about 240 cfs, a near-quadrupling of water flow into North Fork of the Skokomish River.

Jet Flow Gate, Cushman No. 2 Dam (31.8MB Video)
Closeup View of Jet Flow Discharge (31.2MB Video)