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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
411843092105101 075N11W07CCB 1997NAWQA obs/Keokuk County
Sand and gravel aquifers (glaciated regions)
Holocene Alluvium
Holocene Alluvium
LOCATION - Lat 41°18'42.6", long 92°10'50.9" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 SW 1/4 sec.07, T.75 N., R.11 W., Keokuk County, IA, Hydrologic Unit 07080106, 0.8 mi south from intersection of 220th Avenue and 230th Street, and 1.2 mi southeast of Sigourney.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 26 ft. Upper casing diameter 2 in; top of first opening 21 ft, bottom of last opening 26 ft. Drilled observation well, cased to 21 ft. All depths below land-surface datum.
DATUM - Land-surface datum is 678.92 ft above North American Vertical Datum of 1988. Measuring point: top of casing, 3.20 ft above land-surface datum, Apr. 17, 1997 to present. Land-surface datum from levels.
PERIOD OF RECORD - Water-level measurements, water years 1997, 1999, 2005, 2007, 2009-current.
GAGE - Water-level recorder.
PERIOD OF DAILY RECORD - Water-level records from November 2012 to May 2015.
WATER-QUALITY RECORDS
WELL CHARACTERISTICS - Depth 26 ft. Upper casing diameter 2 in; top of first opening 21 ft, bottom of last opening 26 ft. Drilled observation well, cased to 21 ft. All depths below land-surface datum.
DATUM - Land-surface datum is 678.92 ft above North American Vertical Datum of 1988. Measuring point: top of casing, 3.20 ft above land-surface datum, Apr. 17, 1997 to present. Land-surface datum from levels.
PERIOD OF RECORD - Water years 1997, 2007.
