USGS Water-Year Summary 2020
06796500 Platte River near Leshara, Nebr.
LOCATION - Lat 41°19'12", long 96°24'14" referenced to North American Datum of 1983, in sec.34, T.16 N., R.9 E., Douglas County, NE, Hydrologic Unit 10200202, on left bank 25 ft downstream from bridge on Nebraska Highway 64, 1.5 mi southeast of Leshara.
DRAINAGE AREA - Not determined.
PERIOD OF RECORD - June 1994 to current year.
GAGE - Water-stage recorder with satellite telemetry. Datum of gage is 1,144.47 ft above North American Vertical Datum of 1988. Prior to September 26, 2016, datum of gage was 1,143.86 ft above National Geodetic Vertical Datum of 1929. Prior to Oct. 18, 2002, about 200 ft downstream at same datum.
EXTREMES FOR PERIOD OF RECORD - Maximum peak flow, 173,000 ft³/s, March 15, 2019, estimate based on rating curve extension above 84,490 ft³/s, gage height, 11.47 ft. Maximum peak stage, 11.84 ft, February 9, 1996, backwater from ice.
INSTRUMENTATION - Seasonal deployment of a continuous water-quality monitor.
Measured parameters include water temperature, specific conductance, dissolved oxygen, turbidity, and nitrate. Turbidity measurements conform to ISO 7027 standards. Dissolved oxygen measurements were collected using a luminescent sensor. Nitrate measurements were collected using a Hach Nitratax sensor with 2 mm wavelength sensing.
EXTREMES FOR PERIOD OF RECORD
These extremes may have been exceeded during non-measured portions of the record.
WATER TEMPERATURES: Maximum, 36.3°C, July 16, 2017; minimum, 0.0°C,multiple occurrences
SPECIFIC CONDUCTANCE: Maximum, 865 uS/cm, May 23, 2016; minimum, 187 uS/cm, August 7, 2017.
DISSOLVED OXYGEN: Maximum, 15.9 mg/L, April 30, 2020; minimum, 4.0 mg/L, July 22, 2017.
TURBIDITY: Maximum, 1380 FNU, May 19, 2017; minimum, 15.6 FNU, August 5, 2017.
NITRATE CONCENTRATION: Maximum, 5.42 mg/L as NOx, May 26, 2020; minimum, <0.50 mg/L as N, many days.