USGS Water-Year Summary 2023
402618095222701 Tarkio Glacial Drift Aquifer
Sand and gravel aquifers (glaciated regions)
LOCATION - Lat 40°26'18", long 95°22'27" referenced to North American Datum of 1983, Atchison County, MO, Hydrologic Unit 10240005,
REVISIONS HISTORY - Revisions: Land-surface datum was updated to 916.09 ft NAVD88 on May 22, 2023, as determined by a GNSS survey by Missouri DNR. Land-surface datum was previously published as 917 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 916.09 ft above North American Vertical Datum of 1988. Measuring point: Transfer MP created for migration, 0 ft above land-surface datum, Apr. 13, 2016 to Jul. 16, 2020; Transfer MP created for migration, 7.2 ft above land-surface datum, Jul. 16, 2020 to present.
PERIOD OF RECORD - April 13, 2016 to present. Gage was installed on April 12, 2016.
COOPERATION - Data furnished by Missouri Department of Natural Resources (MDNR) and records processed by USGS and MDNR.