USGS Water-Year Summary for Site 14316500

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	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)

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

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USGS Water-Year Summary 2024

14316500 NORTH UMPQUA RIVER ABOVE COPELAND CREEK, NEAR TOKETEE FALLS, OR

LOCATION - Lat 43°17'46", long 122°32'08" referenced to North American Datum of 1927, in NW 1/4 sec.24, T.26 S., R.2 E., Douglas County, OR, Hydrologic Unit 17100301, Umpqua National Forest, on left bank, 0.6 mi upstream from Copeland Creek, 4.7 mi west of town of Toketee Falls and at mile 67.2.

DRAINAGE AREA - 475 mi².

REVISIONS HISTORY -

WSP 1448: 1953(M), 1954, drainage area.

Revision: Annual maximum discharge and gage-height for water year 2021 was revised on Oct. 30, 2023, based on further review of the annual peak discharge and gage-height record.

SURFACE-WATER RECORDS

PERIOD OF RECORD - September 1949 to current year. Monthly discharge only September 1949, published in WSP 1318. Prior to October 1952, published as "above Copeland Creek."

GAGE - Water-stage recorder. Elevation of gage is 1,580 ft above NGVD of 1929, from river-profile map. Prior to Aug. 1, 1976, on right bank at same datum.

REMARKS - Considerable fluctuation caused by powerplants upstream; flow slightly regulated by Diamond Lake (station 14312450), and by Lemolo Lake (active capacity, 12,520 acre-ft). No diversion upstream from station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 40,700 ft³/s Dec. 22, 1964, gage height, 19.1 ft, from floodmark, from rating curve extended above 7,200 ft³/s on basis of slope-area measurement of peak flow; minimum discharge, 327 ft³/s July 11, 2004; minimum daily, 565 ft³/s Sept. 13, 1959.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: June 1998 to September 2003 (seasonal), September 2006 to November 2007.

pH: June 1998 to September 2003 (seasonal), September 2006 to November 2007.

WATER TEMPERATURE: June 1998 to September 2004 (seasonal), October 2004 to current year.

DISSOLVED OXYGEN: June 1998 to September 2003 (seasonal), September 2006 to November 2007.

TURBIDITY: June 2000 to September 2003 (seasonal), September 2006 to November 2007, June 2010 to September 2012.

INSTRUMENTATION - Temperature probe and data logger.

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum, 70 microsiemens Oct. 25, 26, 2006; minimum, 32 microsiemens Dec. 14, 2006.

pH: Maximum recorded, 8.4 units July 28-30, 2001, July 30, Aug. 13, 2002, July 17, 18, 2003; minimum recorded, 7.1 units Aug. 22, 1998.

WATER TEMPERATURE: Maximum, 16.9°C June 29, 30, 2021; minimum, 0.8°C Dec. 9, 2013.

DISSOLVED OXYGEN: Maximum recorded, 13.6 mg/L Dec. 18, 2006, Jan. 13, 2007, but may have been higher during period of missing record; minimum recorded, 6.6 mg/L July 30, 1998.

TURBIDITY: Maximum, 396 FNU Jan. 16, 2011; minimum, <1 FNU on many days each year.