USGS Water-Year Summary 2021
05412400 Volga River at Littleport, IA
LOCATION - Lat 42°45'14", long 91°22'08" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 SE 1/4 sec.25, T.92 N., R.5 W., Clayton County, IA, Hydrologic Unit 07060004, on left bank 10 ft downstream from bridge on County Highway X21 in Littleport, 9.3 mi upstream from confluence with Turkey River, and 8.0 mi southeast of Elkader.
DRAINAGE AREA - 348 mi².
PERIOD OF RECORD - Partial-record low-flow measurement site from September 1957 to July 1977; discharge records from September 1999 to current year.
GAGE - Water-stage recorder. Datum of gage is 677.00 ft above National Geodetic Vertical Datum of 1929.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of May 17, 1999, reached a stage of 25.36 ft, discharge about 30,000 ft³/s, from indirect measurement at Mederville, 2.5 mi upstream from Littleport.