USGS Water-Year Summary 2020
06336000 LITTLE MISSOURI RIVER AT MEDORA, ND
LOCATION - Lat 46°55'05.06", long 103°31'49.24" referenced to North American Datum of 1983, in T.140 N., R.102 W., Billings County, ND, Hydrologic Unit 10110203, on left bank 50 ft above bridge on U.S. Highway 10, one quarter of a mi west of Medora, and 1 1/4 mi upstream from Andrews Creek.
DRAINAGE AREA - 6,190 mi². approximately.
- WSP 546: Drainage area. WSP 1279: 1903-7, 1923-24, 1930-31, 1934(M). When the gage was re-established in March 2001, the base gage was incorrectly set 0.84 ft too low. All gage heights since October 1, 2002, and the 2001 peak stage have been corrected. Unit values and daily values data for water years 2001-02 have not been adjusted. Discharge data for those years are unaffected by this correction.
PERIOD OF RECORD - DAILY DISCHARGE--May 1903 to October 1908, October to November 1921, April, May, and December 1922, May 1923 to September 1924, October 1928 to September 1934, October 1945 to September 1975, March 2001 to current year. Monthly discharge only for some periods, published in WSP 1309.
PERIOD OF RECORD.--DAILY GAGE HEIGHT--August 2001 to current year.
GAGE - Water-stage recorder on upstream side of highway bridge. Datum of gage is 2248.44 ft above North American Vertical Datum of 1988 (NAVD88). National Geodetic Vertical Datum of 1929 (NGVD29) datum was converted to NAVD88 datum using the National Geodetic Surveys VDATUM transformation tool in November, 2017. Prior to October 1, 2017, datum was published as 2,246.75 ft above the NGVD29. September 1951 to September 1975, recording gage 600 feet downstream at current datum. October 9, 1945, to August 22, 1951, non-recording gage at current location at current datum. Prior to October 9, 1945, non-recording gages at several sites within 0.2 miles upstream from present site at various datums.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: March 1947 to September 1949, April to November 2013, March to November 2016 (discontinued).
SPECIFIC CONDUCTANCE: April to November 2013, March to November 2016 (discontinued).
PH: April to November 2013, March to November 2016 (discontinued).
DISSOLVED OXYGEN: April to November 2013, March to November 2016 (discontinued).
INSTRUMENTATION - Multiparameter waterquality monitor.
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum recorded, 33.2°C, July 20, 2016; minimum recorded, 0.1°C, March 20, 2016.
SPECIFIC CONDUCTANCE: Maximum recorded, 3,770 microsiemens, April 30, 2016; minimum recorded, 761 microsiemens, April 6, 2013.
PH: Maximum recorded, 8.7 units, many days; minimum recorded, 7.6 units, May 29, 2013.
DISSOLVED OXYGEN: Maximum recorded, 14.0 milligrams per liter, March 18-20, 2016; minimum recorded, 4.8 milligrams per liter, September 11, 2013.