USGS Water-Year Summary for Site 14034500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00400 pH(Max.,Med.,Min.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

14034500 WILLOW CREEK AT HEPPNER, OR

LOCATION - Lat 45°21'02", long 119°32'56" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 sec.35, T.2 S., R.26 E., Morrow County, OR, Hydrologic Unit 17070104, on right bank, at Heppner, 100 ft upstream from Court Street bridge, 800 ft southeast of Morrow County Courthouse, 0.2 mi downstream from Willow Creek Dam and at mile 52.2.

DRAINAGE AREA - 96.8 mi².

REVISIONS HISTORY - WDR OR-83-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1951 to current year.

GAGE - Water-stage recorder. Concrete control since September 1985. Datum of gage is 1,952.73 ft above NGVD of 1929.

REMARKS - Flow regulated since Feb. 16, 1983 by Willow Creek Lake (active capacity, 13,950 acre-ft). Many diversions for irrigation upstream from station. Part of the flow of Ditch Creek (John Day River basin) is diverted to Willow Creek upstream from station.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, about 36,000 ft³/s June 14, 1903, on basis of slope-area measurement of peak flow (see WSP 96). Flood of Feb. 22, 1949, reached a discharge of 1,700 ft³/s, on basis of slope-area measurement of peak flow.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 812 ft³/s May 10, 1957, gage height, 6.15 ft, from rating curve extended above 230 ft³/s; maximum gage height, 6.46 ft May 25, 1971, backwater from Shobe Canyon; no flow at times.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

WATER TEMPERATURE: February 1963 to June 1968 (daily readings only), March 1972 to June 1973, June 2009 to current year.

pH: February 2020 to current year.

CHEMICAL ANALYSES: March 1972 to June 1973, October 1984 to September 1987.

SEDIMENT RECORDS: February 1963 to June 1968.

INSTRUMENTATION - Water-quality monitor..

EXTREMES FOR PERIOD OF DAILY RECORD -

WATER TEMPERATURE: Maximum, 33.5°C July 4, 1972; minimum, 0.0°C Apr. 3, 1972, Dec. 29-31, 2021, Jan. 1-3, Feb. 23, 25, 2022.

pH: Maximum, 9.3 units on several days during March, August and September 2020; minimum, 7.2 units Apr. 30, May 1-4, 2021.

SEDIMENT CONCENTRATION: Maximum daily, 26,000 mg/L Dec. 22, 1964; minimum daily, no flow on many days during 1966.

SEDIMENT DISCHARGE: Maximum daily, 28,400 tons Dec. 22, 1964; minimum daily, 0 ton on many days during 1966.