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Columbia Plateau Groundwater Availability Study

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Location of Study

Project Contacts:

Sue Kahle
USGS-Washington Water
Science Center

934 Broadway, Suite 300
Tacoma, WA 98402
253-552-1600
sckahle@usgs.gov

Erick Burns
USGS-Oregon Water
Science Center

2130 SW 5th Ave.
Portland, OR 97201
503-251-3250
eburns@usgs.gov

A Part of the U.S. Geological Survey Groundwater Resources Program
Study Map

The Columbia Plateau Regional Aquifer System (CPRAS) covers about 44,000 square miles of eastern Oregon and Washington and western Idaho. The primary aquifers are basalts of the Columbia River Basalt Group and overlying basin-fill sediments. Ground-water availability issues in the basin include: 1) widespread water-level declines caused by pumping, 2) reduction in base flow to rivers and associated effects on temperature and water quality, and 3) effects of global climate change on recharge, base flow, and groundwater availability.

The USGS is conducting a study of the Columbia Plateau Regional Aquifer System with the broad goals of: 1) characterizing the hydrologic status of the system, 2) identifying trends in groundwater storage and use, and 3) quantifying groundwater availability.

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