The facility consists of four rotary drum screens, each 4 feet in diameter and 12 feet long. The screens are constructed of 4.5-12 stainless steel woven wire mesh. This provides clear openings of 0.117 inch and a net open area of 20 percent.
The bypass entrance channel is a full-depth, 18-inch wide rectangular channel. An adjustable weir gate at the end of this channel controls flows that then drop into a 3-foot wide by 9-foot long downwell. Bypass flows are then conveyed through a 21-inch diameter PVC pipe for 475 feet to Ahtanum Creek.