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USGS Water-Year Summary 2024
09266500 ASHLEY CREEK NEAR VERNAL, UT
LOCATION - Lat 40°34'39", long 109°37'17" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 NE 1/4 sec.12, T.3 S., R.20 E., Uintah County, UT, Hydrologic Unit 14060002, on right bank 0.8 mi upstream from head of Utah Power & Light Co.'s canal, 4.5 mi upstream from Dry Fork, and 10 mi northwest of Vernal.
DRAINAGE AREA - 101 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1911 to April 1912, August to December 1912, October 1914 to 1917, 1919 to current year. Monthly discharge only for some periods, published in WSP 1313.
GAGE - Water-stage recorder. Datum of gage is 6,230.61 ft above NGVD of 1929. Prior to November 14, 1917, nonrecording and water-stage recorder at several sites within 1.5 mi of present site at various datums. November 14, 1917 to July 30, 1968, water-stage recorder at site 75 ft downstream at various datums.
REMARKS - Flow increased since July 1940 by water released from Oaks Park Reservoir, capacity, 6,250 acre-ft on Big Brush Creek and diverted to Ashley Creek basin for irrigation. City of Vernal pipeline, capacity, approximately 11 ft³/s diverts water from tributary spring about 1,000 ft above station (diversion began August 1, 1941); at times, part of this flow is returned to Ashley Creek 2.5 mi below station. Prior to September 1961, pipeline capacity was approximately 5 ft³/s and the return flow entered Ashley Creek 0.5 mi below station. Records are fair.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 4,100 ft³/s, Jun 15, 1995, gage height, 5.64 ft, from highwater mark; maximum gage height, 9.05 ft, Jun 16, 1929, datum then in use; minimum, 3.2 ft³/s, Mar 16, 1978.
