Lower WIP

The Lower WIP Canal Diversion (built to handle just 6.4 cfs) is located on the right bank of Ahtanum Creek about 1.5 miles south of the town of Ahtanum, Washington. The current Lower WIP Fishscreen Facility was installed around 1993 because no fish protective facilities were present at the site.

The facility now consists of two rotary drum screens, each 2 feet in diameter by 6 feet long. The screen panels are constructed of perforated stainless steel with 1/8-inch diameter holes.

The bypass entrance channel is a full-depth, 12-inch wide rectangular channel. Bypass flows are then conveyed 120 feet to the Ahtanum Creek through an 8-inch diameter PVC pipe.