USGS Water-Year Summary for Site 05431022

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	Available Parameters
	00060 Discharge(Mean) [(2)]
	80154 Suspnd sedmnt conc(Mean)
	80155 Suspnd sedmnt disch(Mean)
	91049 NO3+NO2, wu(Mean)
	91050 Phosphorus, wu(Mean)
	91057 NH3+orgN, wu(Mean)

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

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USGS Water-Year Summary 2023

05431022 DELAVAN LAKE OUTLET AT BORG ROAD NEAR DELAVAN, WI

LOCATION - Lat 42°36'53", long 88°37'29" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.20, T.2 N., R.16 E., Walworth County, WI, Hydrologic Unit 07090001, on right bank 50 ft upstream from bridge on Borg Road, 1.4 mi southeast of Delavan, and 0.2 mi downstream from Delavan Lake dam outlet.

DRAINAGE AREA - 42.1 mi² of which 2.30 mi² probably is noncontributing.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1983 to September 2009 (discontinued). January 2021 to present.

GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 914.50 ft above NGVD of 1929 or 918.10 ft above NAVD of 1988 (Public Service Commission bench mark).

COOPERATION - Observer furnished by Delavan Lake Sanitary District.

REMARKS - Records are rated "good", except for flows below 2 cubic feet per second and estimates, which are "poor". Gage-height telemeter at station.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 1983 to September 2009 (discontinued). January 2021 to present.

PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT DISCHARGE: Water years 1984-85, 1990-91. January 2021 to present. TOTAL-PHOSPHORUS DISCHARGE: October 1983 to September 2009 (discontinued). January 2021 to present.

INSTRUMENTATION - Automatic pumping sampler from October to December 1983. Manual samples collected from January 1984 to September 30, 2009, January 2021 to present.

REMARKS - Records good except those for estimated daily discharges, which are poor.

EXTREMES FOR PERIOD OF RECORD - SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum observed, 238 mg/L, Feb. 22, 1985; minimum observed, 1 mg/L, on many days. SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 29 tons, Feb. 25, 1985; minimum daily, 0.00 ton, on many days during 1990 and 1991 water years. DISSOLVED CHLORIDE CONCENTRATIONS: Maximum observed, 71 mg/L, June 5, 1995; minimum observed, 40 mg/L, July 5, 1995. TOTAL-PHOSPHORUS CONCENTRATIONS: Maximum observed, 6.00 mg/L, Jan. 5, 1990; minimum observed, <0.01 mg/L, Mar. 9-10, 1990, several days during 1992, 1994, and 1995 water years, and Oct. 2, 1995. TOTAL-PHOSPHORUS DISCHARGE: Maximum daily, 585 lb, Feb. 22, 1994; minimum daily, 0.00 lb, Aug. 9, 13, 1987, many days during 1990, 1991, and 1994 water years, Dec. 4, 1994, July 10-11, 1995, Oct. 1-5, 1995, Sept. 27, 1996, several days in 2005 water year, many days in 2006 water year, and Nov. 18-20, 2006.

EXTREMES FOR CURRENT YEAR - TOTAL-PHOSPHORUS CONCENTRATIONS: Maximum observed, 0.24 mg/L, Dec. 30; minimum observed, 0.02 mg/L, Aug. 26 and 28. TOTAL-PHOSPHORUS DISCHARGE: Maximum daily, 253 lb, Dec. 30; minimum daily, 0.02 lb, Aug. 24,25, and Sept. 30.