The Crescent Lake unit totals 360 acres of forest, swamp and farmed fields, located three miles south of Monroe. It was purchased by WDFW in 1974 for public waterfowl and pheasant hunting and other wildlife recreation. Crescent Lake itself is a 10-acre oxbow lake that was once part of the Skykomish River. Riley Creek runs through another former river channel and enters into the Snoqualmie River near the northwest corner. There is a 25-acre marsh, about 215 acres of deciduous woodland, and 110 acres that are farmed through sharecrop agreements that leave cereal grains standing for wintering waterfowl. In the 1970s and 1980s, small openings and connecting trails were created in the forest to provide edge habitat and areas for hiking and nature observation. There are also about two miles of mowed trails that wind along the lake and Riley Creek. A 200-foot long footbridge built across the lake in 1978 completes the loop. There is a gravel parking area with reader boards at the north and south ends of the property.