Toppenish Pump

The Toppenish Pump diversion (about 90 cfs) is located on the right bank of Toppenish Creek in Yakima County, Washington. There was no screening facility at the site prior to construction of the current facility.

The facility consists of six rotary drum screens, each 5 feet in diameter by 12 feet long. The screens are constructed of 4.5-12 woven wire mesh (1/8-inch openings).

The bypass entrance channel is a full-depth, 18-inch wide rectangular channel that is 13 feet long. An adjustable weir gate at the end of this channel controls flows that then drop into an L-shaped downwell. The two sections are 3 feet wide by 6.5 feet long and 3 feet wide by 8.5 feet long. Bypass flows are then conveyed through a 24-inch diameter PVC pipe for 232 feet to the river.