USGS Water-Year Summary 2023

385837090594701 Troy (2)

Cambrian-Ordovician aquifer system
Canadian Series

LOCATION - Lat 38°58'37.6", long 90°59'45.9" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 sec.27, T.49 N., R.1 W., Lincoln County, MO, Hydrologic Unit 07110008,

REVISIONS HISTORY - Revisions: Land-surface datum was updated to 642.91 ft NAVD88 on May 22, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published as 642 ft NAVD88 from topographic map. Discrete water-level measurements prior to May 22, 2023, are referenced to the original datum.

GROUNDWATER RECORDS

DATUM - Land-surface datum is 642.91 ft above North American Vertical Datum of 1988. Measuring point: unknown, 0.4 ft above land-surface datum, Oct. 1, 1955 to present.  

PERIOD OF RECORD - May 20, 2000 to present.

GAGE - May 20, 2000 to present; DCP with telemetry capability. May 20, 2000 to January 25, 2006, the water level measuring device was a float and encoder. From January 25, 2006 to the present, the water level measuring device is a vented, submersible pressure transducer.

COOPERATION - Data furnished by Missouri Department of Natural Resources (MDNR).

REMARKS - Furnished record rated good (May 20, 2000 to November 30, 2009) based on 32 water level measurements made during this period to verify recorded water levels. Record from 12/01/2009 to 04/13/2010 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.1 ft. Record from 04/14/2010 to 08/31/2011 is good based on 6 water level measurements made during the period to verify the recorded data. These data are accurate to +/- 0.1 ft except for the period 02/02/2011 to 08/31/2011, which are accurate to +/- 0.3 ft. Record from 08/31/2011 to 07/17/2012 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.1 ft. The record from 07/18/2012 to 07/02 2013 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.20 ft. The record from 07/03/2013 to 01/20/2015 is good based on 4 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. The record from 01/21/2015 to 06/06/2016 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. During this period the pressure transducer experienced multiple unexplained jumps. The record from 06/07/2016 to 11/15/2016 is good based on 1 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. During this period the pressure transducer experienced one unexplained jump. The record from 11/16/2016 to 01/31/2018 is good based on 3 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft. During the period the pressure transducer experienced one unexplained jump. The record from 02/01/2018 to 08/21/2018 is fair based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. During the period the pressure transducer experienced significant drift. The record from 08/22/2018 to 02/26/2019 is fair based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. During the period the pressure transducer experienced significant drift. The record from 02/27/2019 to 03/25/2019 is fair based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. During the period the pressure transducer experienced significant drift. The record from 03/26/2019 to 09/10/2019 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft. 

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