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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.
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USGS Water-Year Summary 2024
415439093094801 082N20W15DBC 2008IACRN-5
Sand and gravel aquifers (glaciated regions)
Pleistocene Series
Pleistocene Series
LOCATION - Lat 41°54'38.8", long 93°09'47.7" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 SE 1/4 sec.15, T.82 N., R.20 W., Marshall County, IA, Hydrologic Unit 07080106, 250 ft east of intersection of State Highways 234 and 330, and 0.9 mi southeast of Rhodes.
REVISIONS HISTORY - Revisions: Land-surface datum was updated to 1,018.19 ft NAVD88 on September 15, 2022, as determined by a GNSS Level II survey. Land-surface datum was previously published as 1,017.78 ft NAVD88 from levels.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 38.5 ft. Upper casing diameter 2 in; top of first opening 13.3 ft, bottom of last opening 35.8 ft. Drilled observation well, cased to 38.5 ft. All depths below land-surface datum.
DATUM - Land-surface datum is 1,018.19 ft above North American Vertical Datum of 1988. Measuring point: top of casing, 1.45 ft above land-surface datum, May. 13, 2008 to Nov. 29, 2012; top of casing, 1.84 ft above land-surface datum, Nov. 29, 2012 to present. Land-surface datum from levels.
PERIOD OF RECORD - Water-level measurements, water years 2009-2014 and 2017.
GAGE - Water-level recorder.
REMARKS - Well depth extended from 23.0 ft to 38.5 ft on November 29, 2012. Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center.
PERIOD OF DAILY RECORD - Water-level records from January 2009 to August 2012, November 2012 to September 2014, October 2016 to current.
