USGS Water-Year Summary 2021
05486000 North River near Norwalk, IA
LOCATION - Lat 41°27'28.5", long 93°39'17.1" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 SW 1/4 sec.20, T.77 N., R.24 W., Warren County, IA, Hydrologic Unit 07100008, on left bank 10 ft downstream from bridge on County Highway R57, 1.7 mi southeast of Norwalk, 5.2 mi upstream from Middle Creek, 6.2 mi downstream from Badger Creek, and 22.8 mi upstream from mouth.
DRAINAGE AREA - 349 mi².
- WSP 1438: Drainage area. WSP 1508: 1946. WDR IA-76-1: 1975(P).
PERIOD OF RECORD - Discharge records from February 1940 to current year.
GAGE - Water-stage recorder. Datum of gage is 788.45 ft above National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps of Engineers). Prior to June 12, 1946, non-recording gage at same site and datum; January 7 to October 11, 1960, non-recording gage at site 2.1 mi upstream at different datum.