USGS Water-Year Summary for Site 04040000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(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

04040000 ONTONAGON RIVER NEAR ROCKLAND, MI

LOCATION - Lat 46°43'15", long 89°12'25" referenced to North American Datum of 1927, in NE 1/4 sec.20, T.50 N., R.39 W., Ontonagon County, MI, Hydrologic Unit 04020102, on left bank 150 ft downstream from bridge on Victoria Road, 1.8 mi southwest of Rockland, and 2.4 mi downstream from confluence of Middle and West Branches.

DRAINAGE AREA - 1,340 mi².

REVISIONS HISTORY - WSP 1387: 1943, 1946-47. WSP 1911: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - June 1942 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 638.66 ft above NAVD 88, converted on July 9, 2020 from NGVD 29. Prior to Nov. 23, 1943, nonrecording gage, and Nov. 23, 1943, to Oct. 17, 1967, water-stage recorder at site 50 ft upstream at same datum.

REMARKS - Flow regulated by Victoria powerplant on West Branch 5 mi upstream; Bond Falls Reservoir 34 mi upstream; Lake Gogebic (station 04035995); and Cisco Lake (station 04037400), in headwaters.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 42,000 ft³/s, Aug. 22, 1942, from rating curve extended above 24,000 ft³/s on basis of slope-area measurement of peak flow, gage height, 28.60 ft, from floodmark.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1967, 1972-95, 2011 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 1974 to September 1981, July 2011 to current, (seasonal only). pH: July 2011 to November 2018, (seasonal only). WATER TEMPERATURE: October 1974 to September 1981, July 2011 to current, (seasonal only). DISSOLVED OXYGEN: July 2011 to current, (seasonal only). TURBIDITY: July 2011 to current, (seasonal only).

INSTRUMENTATION - Water-quality monitor from Oct. 15, 1975 to Sept. 30, 1977. Water-quality monitor telemeter since July 8, 2011.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum (more than 20% missing record), 192 µs/cm, Mar. 26, 1977, May 28, 1978; minimum, 27 µs/cm, Oct. 3, 2021. pH: Maximum, 8.9 units, on July 21, 2016; minimum, 6.8 units, Apr. 14, 2014. WATER TEMPERATURE: Maximum, 28.2°C, July 20, 2011; minimum, -0.1°C, on many days during winter periods. DISSOLVED OXYGEN: Maximum, 14.6 mg/l, Nov. 13, 2013; minimum, 6.1 mg/l, June 13, 2021. TURBIDITY: Maximum, 1300 FNU, June 21, 2013; minimum, 1.3 FNU, Aug. 5, 2014.