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The AAPG/Datapages Combined Publications Database
Montana Geological Society
Abstract
MTGS-AAPG
Montana Geological Society and Yellowstone Bighorn Research Association Joint Field Conference and Symposium: Geology of the
Beartooth Uplift and Adjacent Basins
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HYDROGEOLOGY OF THE DRY FORK-EAST BOULDER VALLEY, SOUTH-CENTRAL MONTANA
ABSTRACT
The Dry Fork-East Boulder Valley is a structural valley along the Beartooth Mountain front. Aquifers in the valley are present in bedrock formations of Paleozoic and Mesozoic age, and alluvial and glacial deposits of Quaternary age. Springs, which are common in the bedrock, have yields of as much as 2,000 gallons per minute. Surface water percolates into the alluvium along Dry Fork Creek where water levels fluctuate as much as 124 feet. This water moves into the alluvial and glacial deposits of the East Boulder River valley and eventually appears as streamflow in the downstream part of Dry Fork Creek and the East Boulder River. The dissolved-solids concentration ranges from 95 to 328 milligrams per liter in water from wells and springs, and from 27 to 170 milligrams per liter in water from streams. The waters generally are a calcium bicarbonate type.
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