USGS Water-Year Summary for Site 14158850

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean,Min.,Max.)
	00300 Dissolved oxygen(Min.,Max.,Mean)
	00400 pH(Min.,Max.,Med.)
	32295 fDOM, water, in situ(Min.,Mean,Max.)
	32316 fChl, water, in situ(Min.,Max.,Mean)
	32319 fPC, water, in situ(Max.,Mean,Min.)
	63680 Turbidity, Form Neph(Min.,Max.,Med.)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

14158850 MCKENZIE RIVER BELOW TRAIL BRIDGE DAM, NEAR BELKNAP SPRINGS, OR

LOCATION - Lat 44°16'05", long 122°02'55" referenced to North American Datum of 1927, Linn County, OR, Hydrologic Unit 17090004, (unsurveyed), Willamette National Forest, on left bank, 0.4 mi downstream from Trail Bridge Dam, 0.5 mi upstream from Anderson Creek, 5 mi north of town of Belknap Springs and at mile 81.5.

DRAINAGE AREA - 184 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1959 to current year.

GAGE - Water-stage recorder. Datum of gage is 1,980.00 ft above NGVD of 1929 (levels by Eugene Water & Electric Board). Prior to Oct. 11, 1963, at datum 5.60 ft higher.

REMARKS - Flow regulated since 1963 by Smith River Reservoir (active capacity, 9,900 acre-ft). Diurnal fluctuations caused by powerplants and by Trail Bridge Reservoir (active capacity for reregulating purposes, 2,100 acre-ft). Water is diverted from McKenzie River in SW 1/4 sec.20, T.14 S., R.7 E., to Smith River Reservoir and returned to river upstream from station. Computation of monthly and annual adjusted flows discontinued water year 2014. Continuous water-quality records for periods November 1976 to September 1985 and July 1992 to September 1993 have been collected at this location.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 11,200 ft³/s Dec. 22, 1964, gage height, 12.45 ft, from rating curve extended above 3,700 ft³/s on basis of slope-area measurement of peak flow; minimum discharge, 185 ft³/s Feb. 3, 1963; minimum daily, 423 ft³/s Nov. 22, 1993.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: November 1976 to September 1985, July 2017 to current year.

WATER TEMPERATURE: November 1976 to September 1985, July 1992 to September 1993, July 2017 to current year.

pH: January 2021 to current year.

DISSOLVED OXYGEN: January 2021 to current year.

TURBIDITY: January 2021 to current year.

INSTRUMENTATION - Water-quality monitor. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.

REMARKS - TURBIDITY: Data collected using a YSI EXO2 sonde. Manufacturer's stated accuracy is the greater of +/- 2 percent of reading or 0.3 Formazin Nephelometric Units (FNU) for 0-999 FNU, and +/- 5 percent for 1,000-4,000 FNU. FNU values below 10 are reported to nearest 0.1 FNU. Negative recorded values are reported as 0.0 FNU. Additional parameters collected at this location are available via NWISWeb.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 67 microsiemens Nov. 9, 10, 1977; minimum, 35 microsiemens Dec. 15, 1977, Apr. 8, 9, 2019.

pH: Maximum, 7.9 units on many days in 2023; minimum, 7.3 units on many days 2021-2023.

WATER TEMPERATURE: Maximum, 12.4°C Aug. 4, 2018; minimum, 2.0°C Dec. 24, 25, 1983.

DISSOLVED OXYGEN: Maximum, 13.1 mg/L Feb. 23, 24, 2021; minimum, 10.5 mg/L July 6, 2021, Aug. 4, 15, 2023.

TURBIDITY: Maximum, 14 FNU Aug. 9, 2021; minimum, <1 on many each year.