USGS Water-Year Summary for Site 06795500

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	Available Parameters
	00010 Temperature, water(Max.,Min.)
	00010 Temperature, water(Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Mean,Max.,Min.)
	00300 Dissolved oxygen(Max.,Mean,Min.)
	63680 Turbidity, Form Neph(Max.,Mean,Min.)

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

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USGS Water-Year Summary 2023

06795500 Shell Creek near Columbus, Nebr.

LOCATION - Lat 41°31'33.47", long 97°16'53.75" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.23, T.18 N., R.1 E., Platte County, NE, Hydrologic Unit 10200201, on right bank 10 ft upstream from county road bridge, 1 mi upstream from Loseke Creek, 7 mi northeast of Columbus, and at mile 32.2.

DRAINAGE AREA - 294 mi².

REVISIONS HISTORY - WDR NE-94-1: Drainage Area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - August 1947 to September 1975, October 1977 to current year.

GAGE - Water-stage recorder with satellite telemetry. Datum of gage is 1,420.786 ft above North American Vertical Datum of 1988 (NAVD88). June 02, 1947 to September 30, 1975, at present site and at datum 1,430.786 ft above NAVD88; October 01, 1975 to September 30, 1977, gage not operated; October 01, 1977 to November 01, 2021, at present site and at datum 1,430.786 ft above NAVD88.

REMARKS - Accuracy of records for water years prior to 2014 are noted in the individual Annual Data Reports for those water years. For water years 2014 onward, records fair except for estimated daily discharges, which are poor, unless otherwise noted.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 2, 1947, reached a stage of 21.7 ft, from floodmark, discharge, 4,600 ft³/s, at datum then in use. According to local residents, this was the highest occurrence since 1912.

EXTREMES FOR PERIOD OF RECORD - Maximum peak flow, 11,200 ft³/s, May 30, 2008, gage height, 22.06 ft, at datum then in use. Maximum peak stage, 22.76 ft, June 17, 1990, discharge, 8,000 ft³/s, at datum then in use.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1974-1975, 1977, 1989-1990, 1992-1995, 2003, 2008 to October 2012, March to October 2014.

PERIOD OF DAILY RECORD - WATER TEMPERATURE: March 2008 to October 2012 (seasonal records only). March 2014 to October 2015(seasonal records only). SPECIFIC CONDUCTANCE: March 2008 to October 2012 (seasonal records only). March 2014 to October 2015(seasonal records only). TURBIDITY: March 2008 to October 2012 (seasonal records only). March 2014 to October 2015(seasonal records only). DISSOLVED OXYGEN: March 2008 to October 2012 (seasonal records only). March 2014 to October 2015(seasonal records only).

INSTRUMENTATION - Seasonal deployment of a continuous water-quality monitor. Measured parameters include water temperature, specific conductance, dissolved oxygen, and turbidity. Turbidity measurements conform to ISO 7027 standards and were made using a Yellow Springs International (YSI) 6136 sensor. Dissolved oxygen measurements were collected using an optical dissolved oxygen sensor.

EXTREMES FOR PERIOD OF RECORD - Extremes computed from approved periods of record, and may have been exceeded during non-measured periods. WATER TEMPERATURE: Maximum, 33.3°C, July 25, 2012; minimum, 1.4°C, March 21, 2010. SPECIFIC CONDUCTANCE: Maximum, 996 uS/cm, September 11, 2011; minimum, 119 uS/cm, September 16, 2016. DISSOLVED OXYGEN: Maximum, 26.1 mg/L, August 29, 2008; minimum, 0.1 mg/L, June 5, 2008. TURBIDITY: Maximum, >1,000 FNU, sensor limit exceeded numerous times, typically during periods of runoff; minimum, 3.7 FNU, September 19, 2011.