The current Bull Diversion 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 Bull ditch diversion (approximately 20 cfs) is located on a side channel on the left bank of the Yakima River about 1 mile southwest of the city of Ellensburg, Washington.
The facility is comprised of two vertical flat plate screens, each 6 feet high by 13 feet long. The screen panels are constructed of perforated plate stainless steel with 3/32-inch diameter holes spaced on 5/32-inch centers.
No fishscreen bypass is required at this site since the screen is located at the entrance to the diversion. The screen is cleaned using a motor-driven ganged brush cleaning system.