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Water-Year Summary for Site USGS 06801000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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Available Parameters
00010 Temperature, water(Mean,Max.,Min.)  
00060 Discharge(Max.,Min.,Mean)  
00065 Gage height(Mean,Max.,Min.)  
00095 Specific cond at 25C(Max.,Mean,Min.)  
00300 Dissolved oxygen(Max.,Mean,Min.)  
00630 NO3+NO2, wu(Max.,Mean,Min.)  
63680 Turbidity, Form Neph(Mean,Max.,Min.)  

Water year 2020: 2020-10-01 to 2021-09-30
 

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USGS Water-Year Summary 2020
06801000 Platte River near Ashland, Nebr.
LOCATION - Lat 41°03'44", long 96°19'29" referenced to North American Datum of 1983, in sec.29, T.13 N., R.10 E., Sarpy County, NE, Hydrologic Unit 10200202, on left bank, 35 ft northeast of upstream side of Highway 6 bridge, 3 mi northeast of Ashland, 2 mi upstream from Salt Creek, and at mile 27.9.
DRAINAGE AREA - 83,600 mi² of which 14,300 mi² probably is noncontributing.
REVISIONS HISTORY - WDR NE-94-1: 1993 (M). WDR-US-2010: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1928 to May 1953, July 1988 to current year.
GAGE - Water-stage recorder with satellite telemetry. Datum of gage is 1,040.59 ft above North American Vertical Datum of 1988 (NAVD88). Prior to Oct. 1, 1929, chain gage at former highway bridge 0.5 mi upstream at datum 1,055.83 ft above National Geodetic Vertical Datum of 1929 (NGVD29). Oct. 1, 1929 to Oct. 7, 1933, staff or chain gage at former highway bridge 0.5 mi upstream at datum 1,054.79 ft above NGVD29. Oct. 14, 1933 to Dec. 10, 1938, water-stage recorder at site 950 ft upstream from former bridge at datum 1,054.79 ft above NGVD29. Dec. 11, 1938 to June 16, 1948, water-stage recorder at former highway bridge 0.5 mi upstream at datum 1,054.79 ft above NGVD29. June 17, 1948 to May 11, 1953, 0.5 mi downstream of Highway 6 bridge at datum 1,052.51 ft above NGVD29. The gage was discontinued on May 11, 1953, and was re-established July 21, 1988. July 21, 1988 to Jan. 15, 2020, at present location at datum 1,040.00 ft above NGVD29.
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. Natural flow of stream affected by transmountain diversions, storage reservoirs, power developments, groundwater withdrawals, diversions for irrigation, and return flow from irrigated areas.
EXTREMES FOR PERIOD OF RECORD - Maximum peak flow, 215,000 ft³/s, estimated from rating curve extension above 131,000 ft³/s, March 16, 2019, gage height, 24.32 ft.
WATER-QUALITY RECORDS
INSTRUMENTATION - A continuous water quality sensor was seasonally deployed beginning in 2019. A YSI Exo3 monitor was used. Monitored parameters include water temperature, specific conductance, dissolved oxygen, turbidity and nitrate. Nitrate measurements were made using a Hach Nitratax with a 2 mm wavelength.
EXTREMES FOR PERIOD OF RECORD -

Extremes computed from periods of approved record since 2003, and may have been exceeded during non-measured periods.

WATER TEMPERATURE: Maximum, 32.1 °C, July 19, 2019; minimum, 0.0 °C, various days during winter periods.

SPECIFIC CONDUCTANCE: Maximum, 1030 uS/cm, January 22, 2020; minimum, 299 uS/cm, September 19, 2019.

DISSOLVED OXYGEN: Maximum, 14.5 mg/L, August 8, 2019; minimum, 5.8 mg/L, August 5, 2019.

TURBIDITY: Maximum, 1030 FNU, May 28, 2019 ; minimum, 3.8 FNU, January 23, 2020.

NITRATE: Maximum, 6.37 mg/L N, July 6, 2019; minimum, <0.50 on numerous occasions.