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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
05211000 MISSISSIPPI RIVER AT GRAND RAPIDS, MN
LOCATION - Lat 47°13'56", long 93°31'48" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 sec.27, T.55 N., R.25 W., Itasca County, MN, Hydrologic Unit 07010103, on left bank, 650 ft downstream from Blandin Dam, 150 ft upstream from bridge on U.S. Highway 169, 2.5 mi upstream from Prairie River, and at mile 1,182 upstream from Ohio River.
DRAINAGE AREA - 3,370 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1883 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,242.03 ft above sea level (NGVD of 1929). See WSP 1914 for history of changes prior to Jan. 17, 1951. Datum of gage in NAVD88 is 1242.84 ft.
REMARKS - Flow regulated by Winnibigoshish Lake, Leech Lake, Pokegama Lake, Blandin Dam (up to 16 ft³/s diverted for paper production), and occasionally at low flow by power plant at Blandin Dam. Backwater from Prairie River occurs at times in most years.
Daily discharge records good except those for estimated daily discharges, which are poor.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 12,500 ft³/s, Sept. 3, 1948, (from rating curve extended above 4,500 ft³/s), gage height 15.20 ft, from flood mark, result of dam failure); maximum daily-mean discharge, 8,900 ft³/s, Sept. 29, 1914; minimum discharge, 0.00 ft³/s (many days, several years).
