USGS Water-Year Summary 2023
370539093494002 Mt. Vernon Springfield Plateau Aquifer
Ozark Plateaus aquifer system
Osagean Series
LOCATION - Lat 37°05'39.1", long 93°49'40.4" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 sec.36, T.28 N., R.27 W., Lawrence County, MO, Hydrologic Unit 11070207,
REVISIONS HISTORY -
Revisions: Land-surface datum was updated to 1,218.45 ft NAVD88 on May 22, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published as 1,215 ft NGVD29 from a topographic map. Discrete water-level measurements prior to May 22, 2023, are referenced to the original datum.
Because this well is not in good hydraulic connection with the aquifer, its daily fluctuation is small. Gage resets less than 0.1 ft appear as data offsets at this site. It was decided to apply prorated corrections to gage resets that occurred in wy 2008 even though the corrections were small and the data had been previously approved.
A prorated correction from zero to 0.08 ft was applied to the period 10/02/2007 to 11/06/2007.
A prorated correction from zero to 0.06 ft was applied to the period 11/06/2007 to 01/22/2008.
A prorated correction from zero to 0.03 ft was applied to the period 01/22/2008 to 09/11/2008.
The record from 02/07/2010 to 04/07/2010 was modified after it was previously set to 'Approved' by applying a -0.01 ft correction to the period to improve the data according to a water level measurement on 04/07/2010 that was previously ignored.
GROUNDWATER RECORDS
DATUM - Land-surface datum is 1,218.45 ft above North American Vertical Datum of 1988. Measuring point: DNR DCP platform, 1.5 ft above land-surface datum, May. 1, 2007 to present.
PERIOD OF RECORD - May 09, 2007 to present.
GAGE - May 10, 2007 to present; Water level recording device is a DCP with telemetry capability; the water level measuring device is a float and encoder.
COOPERATION - Data furnished by Missouri Department of Natural Resources (MDNR). Data processed by USGS and MDNR.