USGS Water-Year Summary 2023
05471500 South Skunk River near Oskaloosa, IA
LOCATION - Lat 41°21'20.53", long 92°39'26.48" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 SW 1/4 sec.25, T.76 N., R.16 W., Mahaska County, IA, Hydrologic Unit 07080105, on left bank 10 ft downstream from bridge on U.S. Highway 63, 4.0 mi north of Oskaloosa, 0.3 mi downstream from Painter Creek, 51.2 mi upstream from confluence with North Skunk River, and 145.9 mi upstream from mouth of Skunk River.
DRAINAGE AREA - 1,635 mi².
REVISIONS HISTORY - WSP 1438: Drainage area. WDR IA-95-1: Location.
Revisions: Gage datum was updated to 685.08 ft NAVD88 on January 3, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 685.50 ft NGVD29 from levels.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from October 1945 to current year. Prior to October 1966, published as "Skunk River near Oskaloosa"; prior to October 1948, monthly mean discharge for some periods published in WSP 1308.
GAGE - Water-stage recorder. Datum of gage is 685.08 ft above North American Vertical Datum of 1988. Prior to November 21, 1947, non-recording gage at same site and datum; November 21, 1947, to May 3, 1995, at site 400 ft upstream at same datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in May 1944 reached a stage of 25.8 ft, from high-water mark, discharge 37,000 ft³/s, from rating curve extended above 18,000 ft³/s on basis of velocity-area study.
