USGS Water-Year Summary for Site 395043091262601

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	Available Parameters
	72019 Water level, depth LSD(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

395043091262601 Hannibal

Mississippi River Valley alluvial aquifer
Holocene Alluvium

LOCATION - Lat 39°50'43.2", long 91°26'26.5" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NE 1/4 sec.10, T.58 N., R.5 W., Marion County, MO, Hydrologic Unit 07110004,

REVISIONS HISTORY - Revisions: Land-surface datum was updated to 485.25 ft NAVD88 on May 22, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published as 480 ft NGVD29 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 485.25 ft above North American Vertical Datum of 1988. Measuring point: unknown, 9.0 ft above land-surface datum, May. 22, 1957 to present.

PERIOD OF RECORD - May 30, 1957 to present.

GAGE - Stevens model A-35 chart recorder installed May 30, 1957. Stevens model 7001 digital recorder installed September 12, 1988. April 6, 2000 to present; DCP with telemetry capability is the recording device. A float and encoder were used as the water level measuring device until December 19, 2006. From December 19, 2006 to present, a vented, submersible pressure transducer is the water level measuring device.

COOPERATION - Data furnished by Missouri Department of Natural Resources (MDNR); Record from May 30, 1957 to April 6, 2000 furnished from MDNR.

ECOLOGICAL RECORDS

REMARKS -

Furnished record rated good (December 16, 1980 to August 27, 1991) based on 36 water level measurements available for verification which are within 0.5 ft of the daily value measurement. This data has been archived by Missouri Department of Natural Resources (MDNR) and has been verified by USGS.

Furnished record rated fair (August 28, 1991 to April 05, 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 This data has been archived by Missouri Department of Natural Resources (MDNR) and is not available for verification.

Record from 04/06/2000 to 09/30/2008 has been processed by the USGS with limited field water level measurements (11 measurements) during the period to verify the recorded water levels. This record is considered good.

Record from 10/01/2008 to 03/21/2010 is good based on 7 water level measurements made during the period and is accurate to +/- 0.05 except for the period 09/08/2009 to 12/22/2009 which is accurate to +/- 0.1 ft. The field notes do not agree with the DCP data on 12/22/2009, therefore the applied correction for this period was done with some uncertainty.

The record from 03/22/2010 to 06/28/2010 is good based on 2 water level measurements made during the period and is accurate to +/- 0.1 ft.

The record from 06/28/2010 to 10/17/2011 is good based on 4 water level measurements made during the period and is accurate to +/- 0.1 ft.

The record from 10/17/2011 to 07/29/2012 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.10 ft.

The record from 07/30/2012 to 10/15/2013 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 10/16/2013 to 01/21/2015 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 01/22/2015 to 08/01/2016 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 08/02/2016 to 11/15/2016 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft.

The record from 11/16/2016 to 08/14/2017 is good based on 2 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft.

The record from 08/15/2017 to 02/27/2018 is good based on 1 water level measurements made during the period to verify the recorded data and is accurate to +/- 0.05 ft.

The record from 02/28/2018 to 09/04/2018 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 09/05/2018 to 04/24/2019 is good based on 1 water level measurement made during the period to verify the recorded data and is accurate to +/- 0.10 ft.

The record from 04/25/2019 to 09/22/2019 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 later correction notes and remarks can be found in RMS as of 09/23/2019.