The Clark Ditch Diversion (approximately 10 cfs) is located on the left bank of the Naches River near Naches, Washington.

The screening facility consists of one rotary drum screen that is 3 feet in diameter by 8 feet long. The screen is constructed of perforated plate with 3/32 inch diameter holes on 5/32 inch staggered centers.

The bypass is a full-depth, 18-inch wide rectangular channel that is 9.5 feet long. An adjustable weir gate at the end of this channel controls flows that then drop into 3-foot wide by 6-foot long downwell. Bypass flows are then conveyed through a 15-inch diameter PVC pipe for 123 feet to the river.