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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
05451500 Iowa River at Marshalltown, IA
LOCATION - Lat 42°03'57", long 92°54'27" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 SE 1/4 sec.23, T.84 N., R.18 W., Marshall County, IA, Hydrologic Unit 07080208, on right bank 10 ft downstream from bridge on State Highway 14 in Marshalltown, 1,500 ft upstream from Burnett Creek, 2.2 mi upstream from Linn Creek, and 212.7 mi upstream from mouth.
DRAINAGE AREA - 1,532 mi².
REVISIONS HISTORY - WSP 1438: Drainage area. WSP 1558: 1915-1918, 1919(M), 1920, 1921-1923(M), 1924-1927, 1933, 1934(M), 1936, 1938, 1947(M).
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from October 1902 to September 1903, October 1914 to September 1927, October 1932 to current year. Prior to February 1933, monthly mean discharge for some periods published in WSP 1308.
GAGE - Water-stage recorder. Datum of gage is 852.94 ft above North American Vertical Datum of 1988. October 25, 1902, to August 8, 1903, non-recording gage at site 1 mi upstream at different datum; May 21, 1915, to September 30, 1927, and February 1, 1933, to September 1, 1934, non-recording gage at site 1,000 ft upstream at same datum; September 2-20, 1934, non-recording gage at site 1,000 ft downstream at different datum; September 21, 1934, to June 8, 1973, water-stage recorder at site 900 ft downstream at same datum.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1988-1995, 2008, 2012.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Daily instantaneous values collected in conjunction with suspended-sediment samples, March 1988 to February 1995, records fragmentary.
WATER TEMPERATURE: Daily instantaneous values collected in conjunction with suspended-sediment samples, March 1988 to February 1995, records fragmentary.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: March 1988 to February 1995.
