USGS Water-Year Summary for Site 14159500

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	Available Parameters
	00010 Temperature, water(Min.,Max.,Mean)
	00025 Air pressure(Mean,Min.,Max.)
	00047 Pressure, diss gases(Max.,Mean,Min.)
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Min.,Max.,Med.)

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Water year 2018: 2017-10-01 to 2018-09-30

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USGS Water-Year Summary 2018

14159500 SOUTH FORK MCKENZIE RIVER NEAR RAINBOW, OR

LOCATION - Lat 44°08'10", long 122°14'50" referenced to North American Datum of 1927, in NE 1/4 sec.31, T.16 S., R.5 E., Lane County, OR, Hydrologic Unit 17090004, Willamette National Forest, on right bank, 0.2 mi upstream from Cougar Creek, 0.6 mi downstream from Cougar Dam, 2.1 mi south of Rainbow and at mile 3.9.

DRAINAGE AREA - 208 mi².

REVISIONS HISTORY - WSP 1638: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1947 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,236.42 ft above NGVD of 1929 (Federal Highway Administration bench mark). Oct. 1 to Nov. 4, 1947, nonrecording gage at site 40 ft upstream at datum 0.80 ft higher.

REMARKS - Flow regulated since 1963 by Cougar Lake (active capacity, 164,800 acre-ft). No diversion upstream from station. Computation of monthly and annual adjusted flows discontinued water year 2014.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum discharge, 24,500 ft³/s Dec. 28, 1945, gage height, 8.8 ft, from floodmarks, at U.S. Army Corps of Engineers site 40 ft upstream, at datum 0.80 ft higher (computed by U.S. Army Corps of Engineers).

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 17,600 ft³/s Dec. 11, 1956, gage height, 8.66 ft, from rating curve extended above 8,100 ft³/s; maximum gage height, 8.90 ft Dec. 22, 1955 (backwater from debris); minimum discharge, 17 ft³/s Nov. 18, 1965; minimum daily, 85 ft³/s Apr. 26-28, 1977.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - BAROMETRIC PRESSURE: April 2012 to current year.

INSTRUMENTATION - Meteorological monitor.

EXTREMES FOR PERIOD OF RECORD - BAROMETRIC PRESSURE: Maximum, 746 mmHg Dec. 30, 2014; minimum, 706 mmHg Jan. 20, 2017.

REMARKS - BAROMETRIC PRESSURE: Collection, computation, and publication of barometric pressure data do not necessarily conform to standards used by the National Weather Service. Records published in this report are for general scientific use.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -

WATER TEMPERATURE: July 1955 to November 1999, December 2000 to current year.

DISSOLVED OXYGEN: December 2000 to September 2006.

TURBIDITY: December 2000 to September 2006, February 2016 to April 2016.

TOTAL DISSOLVED GAS: April 2012 to current year.

INSTRUMENTATION - Water-quality monitor.

REMARKS - Water-quality data collected at this location may not always provide a representative value of the cross section due to inadequate mixing of flow between the dam (0.6 mi upstream) and probe. Sensor depth collected at this location is not referenced in this document.

EXTREMES FOR PERIOD OF DAILY RECORD -

WATER TEMPERATURE: Maximum, 20.0°C July 28, 1958; minimum, 0.5°C Jan. 20-23, 1962.

DISSOLVED OXYGEN: Maximum, 14.5 mg/L Feb. 23, 2002, result of Cougar Lake tunnel tap; minimum, 7.4 mg/L Sept. 15, 2001.

TURBIDITY: Maximum, 1,410 FNU Feb. 23, 2002, result of Cougar Lake tunnel tap; minimum, <1 FNU on many days each year.

TOTAL DISSOLVED GAS: Maximum, 878 mmHg Dec. 26, 2015; minimum, 710 mmHg Sept. 15, 16, 2015, Jan. 20, 2017.