The screening facility includes four rotary drum screens that are each 4 feet in diameter by 12 feet long. Screens are constructed of 6-14 stainless steel wire mesh (nominal 3/32-inch openings). They are in operation any time diversions are being made from Ahtanum Creek.
The bypass is a full-depth, 18-inch wide rectangular channel that is 11 feet long. An adjustable weir gate at the end of this channel controls flows that then drop into 3-foot wide by 8-foot long downwell. Bypass flows are then conveyed through a 15-inch diameter PVC pipe for 182 feet to the river.