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Potentiometric-surface map of water in the Judith River Formation in the Northern Great Plains area of Montana

Open-File Report 82-562

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Abstract

The potentiometric surface of the Judith River Formation is mapped at a scale of 1:1,000,000. The map is one of a series produced as part of a regional study of aquifers of Cenozoic and Mesozoic age in the northern Great Plains of Montana. The contour interval is 200 feet. Water in the Judith River Formation occurs under water-table and artesian conditions. The direction of regional ground-water movement is from west to east. Water is discharged from the Judith River Formation to the Milk River from near Havre, Montana, to Malta and to the Missouri River south of the Bearpaw and Little Rocky Mountains. The average discharge from 236 wells is about 10 gallons per minute, and the specific capacity of 186 wells averages 0.66 gallon per minute per foot of drawdown. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Potentiometric-surface map of water in the Judith River Formation in the Northern Great Plains area of Montana
Series title:
Open-File Report
Series number:
82-562
Edition:
-
Year Published:
1982
Language:
ENGLISH
Description:
1 map ;45 x 68 cm., on sheet 61 x 104 cm.