Ellensburg Mill

The Ellensburg Mill canal diversion is located on a side channel of the Yakima River about 2 miles west of the city of Ellensburg, Washington. The current Ellensburg Mill fishscreen facility (improved during the 1996/97 construction period) replaces a drum screen that did not meet design criteria for the protection of juvenile and adult anadromous fish during canal diversions.

The facility now consists of three vertical flat plate screen panels, each 6 feet high by 12 feet long. The screens are constructed of 0.069-inch (1.75-mm) wedge wire fabric placed with slots oriented vertically. Control baffles installed immediately downstream of these panels allow flows to be regulated to maintain uniform approach velocities.

A mechanical cleaning brush moves back and forth over the length of the screen to keep the screen free of debris.

The bypass entrance channel is a full-depth, 18-inch wide rectangular channel that is 8 feet long. An adjustable weir gate at the end of this channel controls flows that then drop into 3-foot wide by 6-foot long downwell. Bypass flows are then conveyed through a 16-inch diameter PVC pipe for 72 feet to the river.