USGS Water-Year Summary 2023
05319500 WATONWAN RIVER NEAR GARDEN CITY, MN
LOCATION - Lat 44°02'47", long 94°11'43" referenced to North American Datum of 1927, in SW 1/4 NE 1/4 sec.28, T.107 N., R.28 W., Blue Earth County, MN, Hydrologic Unit 07020010, on left bank 25 ft downstream from bridge on County Highway 13, 1.5 miles west of Garden City, 7.3 mi upstream from mouth, and 9.2 mi downstream from Perch Creek.
DRAINAGE AREA - 851 mi².
REVISIONS HISTORY - WDR MN-78-2: 1977. WRIR 97-4249: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1940 to September 1945, September 1976 to current year. 1953, 1960, 1961, and 1969 (one or more discharge measurements each year).
GAGE - Water-stage recorder. Datum of gage is 905.05 ft above sea level (NGVD of 1929). Prior to September 30, 1945, non-recording gage at site 200 ft upstream and at datum 0.17 ft higher.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Apr. 7, 1965, reached a stage of 18.89 ft at datum 0.17 ft higher, from floodmarks, discharge, 19,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Minimum discharge, 1.8 ft³/s, Dec. 24, 1989 (estimated minimum daily-mean). Maximum discharge, 16100 ft³/s, 18.01ft stage, September 25, 2010.