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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
10164500 AMERICAN FORK ABOVE UPPER POWERPLANT, NEAR AMERICAN FORK, UT
LOCATION - Lat 40°26'52", long 111°40'53" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 NE 1/4 sec.26, T.4 S., R.2 E., Utah County, UT, Hydrologic Unit 16020201, on left bank 600 ft downstream from Rock Creek, 1,000 ft upstream from intake for upper power-plant of PacifiCorp, 4.0 mi upstream from mouth of canyon, and 6.7 mi northeast of American Fork.
DRAINAGE AREA - 51.1 mi².
REVISIONS HISTORY - WSP 1634 Drainage area. WDR-UT-96-1: 1995.
SURFACE-WATER RECORDS
PERIOD OF RECORD - January 1927 to September 2005, June 2, 2011 to current year. Monthly discharge only January 1927 to September 1945, published in WSP 1314. Prior to September 2005, records collected by PacifiCorp (formerly Utah Power & Light Co.) under general supervision of Geological Survey, in connection with a Federal Energy Regulatory Commission project.
GAGE - Water-stage recorder. Datum of gage is 5,937.21 ft. above NAVD of 1988 from Level II GNSS surveys conducted on July 19, 2023. Prior to September 8, 1965, at same site at different datum. September 8, 1965 to November 20, 1967, at site 300 ft upstream.
REMARKS - Flow regulated by Silver Lake Flat Reservoir (constructed 1971) and Tibble Reservoir; total capacity, 1,260 acre-ft. Records are good, except for estimates, which are poor, and other periods as follows: August 18, 2016 to October 6, 2017 which are fair due to control features and gage operation affected by silt deposition from Tibble Reservoir dredging .
EXTREMES FOR PERIOD OF RECORD - Maximum discharge not determined, occurred Jul. 30, 1953, gage height, 9.20 ft, from floodmark; minimum, 1.1 ft³/s, Dec. 20, 1976 (result of freezeup).
