USGS Water-Year Summary for Site 14139800

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	63680 Turbidity, Form Neph(Max.,Min.,Med.)

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

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USGS Water-Year Summary 2024

14139800 SOUTH FORK BULL RUN RIVER NEAR BULL RUN, OR

LOCATION - Lat 45°26'41", long 122°06'30" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.31, T.1 S., R.6 E., Clackamas County, OR, Hydrologic Unit 17080001, Mount Hood National Forest, on right bank, 6.2 mi northeast of Bull Run and at mile 0.6.

DRAINAGE AREA - 15.7 mi². revised.

REVISIONS HISTORY - WDR OR-91-1: 1989.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1974 to current year.

GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 990 ft above NGVD of 1929, from topographic map.

REMARKS - No regulation or diversion upstream from station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,760 ft³/s Jan. 16, 2011, gage height, 9.68 ft; minimum discharge, 5.4 ft³/s Oct. 13, 1994.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: October 1978 to current year.

pH: November 1980 to September 1982, June 1990 to September 1992.

WATER TEMPERATURE: October 1978 to current year.

TURBIDITY: June 1990 to September 1994.

SUSPENDED SEDIMENT DISCHARGE: October 1978 to September 1986.

INSTRUMENTATION - Water-quality monitor.

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum, 63 microsiemens Aug. 27, 2023; minimum, 8 microsiemens Nov. 23, 2017.

pH: Maximum recorded, 8.0 units Aug. 17, Oct. 2, 1990, but may have been higher in water years 1990, 1992 during periods of missing record; minimum recorded, 6.4 units Dec. 6, 1991, but may have been lower during periods of missing record.

WATER TEMPERATURE: Maximum, 18.9°C June 28, 2021; minimum, -0.2°C Dec. 19-22, 27, 2008.

TURBIDITY: Maximum recorded, 16 NTU Oct. 16, 1993; minimum recorded, 0.08 NTU Sept. 2, 1994.

SEDIMENT CONCENTRATION: Maximum daily, 212 mg/L Nov. 7, 1985; minimum, 0 mg/L on many days.

SEDIMENT DISCHARGE: Maximum daily, 794 tons Nov. 7, 1985; minimum, 0 ton on many days.