USGS Water-Year Summary for Site 06336000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

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.

REVISIONS HISTORY - 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.

SURFACE-WATER RECORDS

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 -

Datum of the gage is 2,246.62 feet above North American Vertical Datum of 1988 (NAVD88) and 2,246.75 feet above National Geodetic Vertical Datum of 1929 (NGVD29).

Previous locations and datums are as follows:

May 12^th, 1903 to October 31^st, 1908; Chain gage established on the downstream side of the Northern Pacific Railroad bridge located at 103°31'55.53" W, 46°54'57.82" N (WGS84), just west of Medora, N. Dak, at a datum 0.8 feet lower.

October 11^th, 1921 to September 30^th, 1924; Staff gage on downstream face of middle concrete pier of highway bridge located approximately 200 feet downstream of original gage location at a datum 1 foot lower.

August 31^st, 1928 to September 30^th, 1934; Wire-weight gage on upstream side of highway bridge located approximately 200 feet downstream of original gage location at current datum.

October 9^th, 1945 to August 22^nd, 1951; Wire-weight gage on upstream side of new highway bridge (US Highway 10 [1946]) located approximately 150 feet downstream of original gage location at current datum.

August 23^rd, 1951 to September 30^th, 1975; Staff gage and continuous water-stage recorder in stilling well on left bank, about 600 feet downstream of new highway bridge (US Highway 10 [1946]) at current datum. Wire-weight gage on upstream side of highway bridge was used as an auxiliary gage.

March 1^st, 2001 to present; Wire-weight gage on downstream side of highway bridge (Pacific Ave Bridge in Medora, N. Dak. [2024]) and continuous water-stage recorder on upstream side of highway bridge at current datum.

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 good except for estimated discharges, which are poor, unless otherwise noted.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD -
WATER TEMPERATURE: March 1947 to September 1949, April to November 2013, March to November 2016, April to November 2019, April to October 2022 (discontinued).
SPECIFIC CONDUCTANCE: April to November 2013, March to November 2016, April to November 2019, April to October 2022 (discontinued).
PH: April to November 2013, March to November 2016, April to November 2019, April to October 2022 (discontinued).
DISSOLVED OXYGEN: April to November 2013, March to November 2016, April to November 2019, April to October 2022 (discontinued).

INSTRUMENTATION - Multiparameter waterquality monitor.

REMARKS - Available periods of continuous water quality daily records are internally rated qualitatively as excellent, good, fair, or poor. For questions about periods of record and/or quality ratings, please send an email to gs-w-nd_nwisweb_data_inquiries@usgs.gov.