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USGS Water-Year Summary 2024
06809500 East Nishnabotna River at Red Oak, IA
LOCATION - Lat 41°00'32.5", long 95°14'28.9" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 SE 1/4 sec.29, T.72 N., R.38 W., Montgomery County, IA, Hydrologic Unit 10240003, on downstream side of bridge on Coolbaugh Street in Red Oak, 0.2 mi upstream from Red Oak Creek, 38.1 mi upstream from confluence with West Nishnabotna River, and 53.7 mi upstream from mouth of Nishnabotna River.
DRAINAGE AREA - 894 mi².
REVISIONS HISTORY - WSP 1240: 1921, 1922-1923(M), 1924, 1942(M), 1944(M), 1946. WSP 1440: Drainage area. WSP 1710: 1957.
Revisions: Gage datum was updated to 1005.40 ft NAVD88 on July 27, 2023, based on a GNSS Level II survey using GEOID18.
Revisions: Gage datum was updated to 1005.40 ft NAVD88 on July 27, 2023, based on a GNSS Level II survey using GEOID18.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from May 1918 to July 1925, May 1936 to current year. May 1918 to July 1925, monthly mean discharge for some periods published in WSP 1310.
GAGE - Water-stage recorder. Datum of gage is 1,005.40 ft above North American Vertical Datum of 1988. Prior to July 5, 1925, non-recording gage at same site at datum 4.60 ft higher; May 29, 1936, to November 14, 1952, non-recording gage at site 0.5 mi upstream at datum 5.00 ft higher, with supplementary water-stage recorder in operation above 3.2 ft gage height from March 22, 1951, to November 14, 1952; November 15, 1952, to June 13, 1966, water-stage recorder at site 0.5 mi upstream at datum 5.00 ft higher; June 14, 1966, to September 30, 1969, water-stage recorder at same site at datum 5.00 ft higher.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 7, 1917, reached a stage of 21.7 ft, discharge 23,500 ft³/s.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1963-1973.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1968 to September 1973.
WATER TEMPERATURE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1962 to September 1973.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: October 1962 to September 1973.
