LOCATION.--Lat 40°46'29", long 95°50'05"
referenced to North American Datum of 1927, in NW 1/4 SE 1/4 SW 1/4
sec.18, T.69 N., R.43 W., Fremont County, IA, Hydrologic Unit
10240001, on left bank of Missouri River, 0.1 mi south and 0.6 mi
west from intersection of 185th Avenue and 190th Avenue, and 2.0 mi
northwest of Percival. (map)
GROUNDWATER RECORDS
WELL CHARACTERISTICS.--Depth 47 ft. Upper casing diameter 3 in;
top of first opening 42 ft, bottom of last opening 45 ft. Drilled
observation well, cased to 47 ft. All depths below land-surface
datum.
DATUM.--Land-surface datum is 934.99 ft above National Geodetic
Vertical Datum of 1929. Measuring point: top of casing, 5.08 ft above
land-surface datum, November 20, 1995, to present. Land-surface datum
from GPS.
PERIOD OF RECORD.--Water-level measurements, water years
1996-1997, 2008-2011, 2013-2015.
PERIOD OF DAILY RECORD.--Water-level records from November 1995 to
September 1996, February to July 2006, March 2008 to June 2011,
August 2013 to December 2014, records fragmentary.
GAGE.--Water-level recorder.