Flows of Ashley Creek are regulated by Steinaker Dam, Central Utah Project, Vernal Unit. The Reservoir was constructed offstream in Steinaker Draw about 3.5 miles north of Vernal, Utah. Recreation management at Steinaker Reservoir is performed by the Utah Division of Parks and Recreation under agreement with the Bureau of Reclamation. The recreation area is situated north of Vernal, at 5,520-foot elevation. The reservoir has a surface area of about 800 acres when full.. The recreation season is April through October with high use. Common fish species include rainbow trout and largemouth bass. Fees charged. Reservations accepted for certain campsites. Steinaker Reservoir U.S. Geological Service map covers the area.