USGS Water-Year Summary 2023
382100090592801 St. Clair
Ozark Plateaus aquifer system
Gasconade Dolomite
LOCATION - Lat 38°21'00.9", long 90°59'25.4" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 SE 1/4 sec.26, T.42 N., R.1 W., Franklin County, MO, Hydrologic Unit 07140103,
REVISIONS HISTORY - Revisions: Land-surface datum was revised to 736.11 ft NAVD88 on Oct. 4, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published in error as 720 ft NGVD29 from topographic map. Discrete water-level measurements referenced to NGVD29 and NAVD88 were revised, based on changes to the land-surface datum.
GROUNDWATER RECORDS
DATUM - Land-surface datum is 736.11 ft above North American Vertical Datum of 1988. Measuring point: unknown, 3.1 ft above land-surface datum, Apr. 28, 1956 to present.
PERIOD OF RECORD - April 30, 1956 to present.
GAGE - April 30, 1956 to March 30, 1980; Stevens A-35 strip chart; April 3, 1980 to February 10, 2000 Stevens model 7001 digital recorder; February 24, 2000 to present telemetry DCP. April 28, 2000 to present water level measuring device is float driven encoder.