USGS Water-Year Summary 2023

384849090092001 Columbia Bottoms

Mississippi River Valley alluvial aquifer
Holocene Alluvium

LOCATION - Lat 38°48'46.6", long 90°09'08.7" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 sec.18, T.47 N., R.8 W., St. Louis County, MO, Hydrologic Unit 07140101,

REVISIONS HISTORY -
Revisions: Land-surface datum was updated to 425.82 ft NAVD88 on May 22, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published as 422 ft NGVD29 from a topographic map. Discrete water-level measurements prior to May 22, 2023, are referenced to the original datum.

GROUNDWATER RECORDS

DATUM - Land-surface datum is 425.82 ft above North American Vertical Datum of 1988. Measuring point: unknown, 9.0 ft above land-surface datum, Jun. 24, 1957 to present.  

PERIOD OF RECORD - September 30, 1957 to present.

GAGE - Stevens model A-35 chart recorder installed September 30, 1957. Stevens model 7001 digital recorder installed July 2, 1980. March 16, 2000 to present; DCP with float, encoder, and telemetry capability installed as the water level recording and measuring devices.

COOPERATION - Data furnished by Missouri Department of Natural Resources (MDNR); Record from September 30, 1957 to March 16, 2000 furnished from MDNR.

REMARKS - Furnished record rated fair (Septeber 30, 1957 to March 16, 2000)because no water level measurements are available to verify daily values. This data has been archived by Missouri Department of Natural Resources (MDNR) and is not available for verification. The only available water level measurement was made by the driller when the well was drilled. Data from 03/15/2000 to 09/30/2008 has been processed by the USGS with limited field water level measurements (13 measurements) during the period to verify the recorded water levels. This record is considered fair. Data from 10/01/2008 to 04/14/2010 is good, based on 5 water level measurements made during the period, and is accurate to +/- 0.05 ft. Data from 04/14/2010 to 09/08/2010 is good, based on 4 water level measurements made during the period to verify the recorded data, and is accurate to +/- 0.05 ft. The record from 08/21/2011 to 05/29/2013 is good, based on 3 water level measurements made during the period to verify the recorded data, and is accurate to +/- 0.05 ft. The record from 09/08/2010 to 08/08/2011 is good, based on 4 water level measurements made during the period to verify the recorded data, and is accurate to +/- 0.05 ft. The record from 08/09/2011 to 08/21/2012 is good, based on 5 water level measurements made during the period to verify the recorded data, and is accurate to +/- 0.05 ft. The record from 05/30/2013 to 01/13/2015 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 01/14/2015 to 07/12/2016 is good based on 4 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 07/13/2016 to 07/25/2017 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 07/26/2017 to 04/09/2018 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 04/10/2018 to 09/10/2018 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The record from 09/10/2018 to 09/10/2019 is fair based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.05 ft. The fair rating is due to a large gap in data caused by a stuck float and extreme flooding that prevented DNR from visiting the well all summer. 

All further remarks can be found in RMS as of 09/11/2019.