The Columbia Plateau regional aquifer system (CPRAS) covers parts of Idaho, Oregon, and Washington. It consists primarily of three basalt formations separated by confining units.
The primary aquifers of the Columbia Plateau regional aquifer system (CPRAS) are basaltic lava flows of the Columbia River Basalt Group and overlying basin-fill sediments. Generalized geologic units for the CPRAS include Overburden, Saddle Mountains Basalt, Mabton Interbed, Wanapum Basalt, Vantage Interbed, Grande Ronde Basalt, and Older Bedrock.
The data files listed below are supplemental to Three-dimensional model of the geologic framework for the Columbia Plateau Regional Aquifer System, Idaho, Oregon, and Washington (USGS Scientific Investigations Report 2010-5246). The report includes a description of methods used to derive the data.
Click on the links below to download files for this aquifer. For information about the available file types, see Aquifer data: Explanation of spatial data formats.
Borehole Data: Metadata (25KB XML) Shapefile (880KB ZIP) Text file (238KB ZIP)
Hydrogeologic Unit Extents:
- Columbia River Basalt Metadata (26KB XML) Shapefile (310KB ZIP)
Hydrogeologic Unit Surfaces:
- Overburden (top) Metadata (25KB XML) Raster (7.7MB ZIP) ASCII grid (6.2 MB ZIP)
- Saddle Mountains Basalt (top) Metadata (25KB XML) Raster (6.2MB ZIP) ASCII grid (4.9MB ZIP)
- Wanapum Basalt (top) Metadata (25KB XML) Raster (12.5MB ZIP) ASCII grid (9.7MB ZIP)
- Grande Ronde Basalt (top) Metadata (25KB XML) Raster (21.2MB ZIP) ASCII grid (16.6MB ZIP)
- Older Bedrock (top) Metadata (25KB XML) Raster (26.9MB ZIP) ASCII grid (21.2MB ZIP)
Hydrogeologic Unit Thicknesses:
- Overburden Metadata (25KB XML) Raster (3.9MB ZIP) ASCII grid (3.3MB ZIP)
- Saddle Mountains Basalt and Mabton interbed Metadata (26KB XML) Raster (6.2MB ZIP) ASCII grid (5.3MB ZIP)
- Wanapum Basalt and Vantage/Latah interbed Metadata (25KB XML) Raster (12.4MB ZIP) ASCII grid (10.4MB ZIP)
- Grande Ronde Basalt Metadata (25KB XML) Raster (12.1MB ZIP) ASCII grid (17MB ZIP)
Below are other webpages associated with this aquifer.
Principal Aquifers of the United States
Regional Groundwater Availability Studies
Wells and water levels used in the Columbia Plateau Regional Aquifer System Study, Idaho, Oregon, and Washington
Below are publications associated with this aquifer.
Three-dimensional model of the geologic framework for the Columbia Plateau Regional Aquifer System, Idaho, Oregon, and Washington
Groundwater availability of the Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho
Numerical simulation of groundwater flow in the Columbia Plateau Regional Aquifer System, Idaho, Oregon, and Washington
Hydrogeologic framework and hydrologic budget components of the Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho
Ground Water Atlas of the United States
The Columbia Plateau regional aquifer system (CPRAS) covers parts of Idaho, Oregon, and Washington. It consists primarily of three basalt formations separated by confining units.
The primary aquifers of the Columbia Plateau regional aquifer system (CPRAS) are basaltic lava flows of the Columbia River Basalt Group and overlying basin-fill sediments. Generalized geologic units for the CPRAS include Overburden, Saddle Mountains Basalt, Mabton Interbed, Wanapum Basalt, Vantage Interbed, Grande Ronde Basalt, and Older Bedrock.
The data files listed below are supplemental to Three-dimensional model of the geologic framework for the Columbia Plateau Regional Aquifer System, Idaho, Oregon, and Washington (USGS Scientific Investigations Report 2010-5246). The report includes a description of methods used to derive the data.
Click on the links below to download files for this aquifer. For information about the available file types, see Aquifer data: Explanation of spatial data formats.
Borehole Data: Metadata (25KB XML) Shapefile (880KB ZIP) Text file (238KB ZIP)
Hydrogeologic Unit Extents:
- Columbia River Basalt Metadata (26KB XML) Shapefile (310KB ZIP)
Hydrogeologic Unit Surfaces:
- Overburden (top) Metadata (25KB XML) Raster (7.7MB ZIP) ASCII grid (6.2 MB ZIP)
- Saddle Mountains Basalt (top) Metadata (25KB XML) Raster (6.2MB ZIP) ASCII grid (4.9MB ZIP)
- Wanapum Basalt (top) Metadata (25KB XML) Raster (12.5MB ZIP) ASCII grid (9.7MB ZIP)
- Grande Ronde Basalt (top) Metadata (25KB XML) Raster (21.2MB ZIP) ASCII grid (16.6MB ZIP)
- Older Bedrock (top) Metadata (25KB XML) Raster (26.9MB ZIP) ASCII grid (21.2MB ZIP)
Hydrogeologic Unit Thicknesses:
- Overburden Metadata (25KB XML) Raster (3.9MB ZIP) ASCII grid (3.3MB ZIP)
- Saddle Mountains Basalt and Mabton interbed Metadata (26KB XML) Raster (6.2MB ZIP) ASCII grid (5.3MB ZIP)
- Wanapum Basalt and Vantage/Latah interbed Metadata (25KB XML) Raster (12.4MB ZIP) ASCII grid (10.4MB ZIP)
- Grande Ronde Basalt Metadata (25KB XML) Raster (12.1MB ZIP) ASCII grid (17MB ZIP)
Below are other webpages associated with this aquifer.
Principal Aquifers of the United States
Regional Groundwater Availability Studies
Wells and water levels used in the Columbia Plateau Regional Aquifer System Study, Idaho, Oregon, and Washington
Below are publications associated with this aquifer.