USGS Water-Year Summary 2023
365645093431601 Aurora
Ozark Plateaus aquifer system
Canadian Series
LOCATION - Lat 36°56'37.3", long 93°43'12.6" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 sec.24, T.26 N., R.26 W., Lawrence County, MO, Hydrologic Unit 11070207,
REVISIONS HISTORY -
Revisions: Land-surface datum was revised to 1,470.54 ft NAVD88 on Oct. 4, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published in error as 1,460 ft NAVD88 from topographic map. Discrete water-level measurements referenced to NGVD29 and NAVD88 were revised, based on changes to the land-surface datum.
The data from 11/17/1988 to 12/07/2009 was modified after it was set to 'Approved' status. A -3.0 ft measuring point height correction has been applied to this period of record to reference water level data to land surface instead of the measuring point which was referenced in the field.
A spike on 09/05/2012 at 10:00:00 am CDT was added back to the dataset after it was previously deleted. The spike was likely due to a large earthquake in Costa Rica (7.6 magnitude on 09/05/2012 at 09:45:00 am).
GROUNDWATER RECORDS
DATUM - Land-surface datum is 1,470.54 ft above North American Vertical Datum of 1988. Measuring point: unknown, 3.0 ft above land-surface datum, Sep. 26, 1986 to present.
PERIOD OF RECORD - November 17, 1988 to present.
GAGE - Stevens model A-35 chart recorder installed July 2, 1988. September 15, 2000 to present; DCP with float, encoder, and telemetry capability was installed as the water level recording device.
COOPERATION - Data furnished by Missouri Department of Natural Resources (MDNR)except for period November 17, 1988 to September 30, 1991 during which the data and record was furnished by USGS. The record from September 14, 2000 to present furnished by MDNR and USGS.