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USGS Water-Year Summary 2024
09416000 Muddy River Near Moapa, NV
LOCATION - Lat 36°42'40", long 114°41'40" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.15, T.14 S., R.65 E., Clark County, NV, Hydrologic Unit 15010012, on left bank, 0.1 mi upstream from Battleship Wash, 0.8 mi downstream from Home Ranch, 5 mi northwest of Moapa, 9.5 mi upstream from Meadow Valley Wash, and 26 mi upstream from Lake Mead.
DRAINAGE AREA - 3,944 mi² of which 2,950 mi² probably is noncontributing.
REVISIONS HISTORY - WSP 1243: 1914 (M). WSP 1343: 1950 (M). WSP 1733: Drainage area. Drainage area revised on Mar 26, 2021. Original drainage area was 3,820 mi² of which 3,780 mi² probably was noncontributing.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Jul. 1913 to Sep. 1915, Apr. 1916 to Sep. 1918, Jun. 1928 to Oct. 1931 (monthly discharge only), Apr. to Jul. 1932 (monthly discharge only), Oct. 1944 to current year.
GAGE - Water-stage recorder and Cipolletti weir. Elevation of gage is 1,710 ft above National Geodetic Vertical Datum of 1929, from river-profile map. Oct. 21, 1944 to Sep. 30, 1948, water-stage recorder at datum 1.08 ft higher; Oct. 1, 1948 to April 28, 2009, water-stage recorder at datum 1.02 ft higher.
REMARKS - Diversions for irrigation above station. Beginning Oct. 1, 1976, records do not include part-time diversion about 100 ft upstream, for cooling of powerplants downstream. Normal flow originates from springs in reach 0.9 to 2.5 mi upstream from station. Flood peaks may be dampened by Arrow Canyon Dam starting 1934. Records fair except for discharges greater than 80 ft³/s and estimated discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,760 ft³/s, Aug. 16, 1990, gage height, 13.33 ft, on basis of slope-area measurement of peak flow; maximum gage height, 14.26 ft, Sep. 27, 2014, (backwater from heavy channel vegetation); minimum daily, 19 ft³/s, Oct. 10, 1997, Oct. 6, 2003.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - Recording tipping bucket since Dec. 1989.
EXTREMES FOR PERIOD OF RECORD - Maximum daily precipitation, 2.68 inches, Sep. 08, 2014.
