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The Grant-Platte Basin covers 1,032 square miles in the southwest corner of Wisconsin. Although the basin is named the Grant-Platte Basin, the Galena River is also a major river system in it. The basin includes Grant County south of Military Ridge, the western quarter of Lafayette County, and the southwest corner of Iowa County. The entire basin is in the driftless area of Wisconsin, a region not covered or scoured by the continental ice sheet during the most recent great glacial age, which ended 10,000 to 12,000 years ago. The terrain varies from gently to moderately rolling, unlike the rest of glaciated Wisconsin. The basin is well dissected by numerous perennial streams and non-perennial drainage ways. Local topographic relief is significant and can vary up to 600 feet, resulting in fast-flowing, high gradient streams. The driftless area is also characterized by the lack of natural lakes and a few wetlands. Bedrock is close to the surface and often exposed, particularly on valley walls. All of the principal streams in the basin flow directly to the Mississippi River.
For...
Water Resources, click here.
Land Resources click here.
Wildlife Info, click here.
Grant-Platte Basin Map, click here.
For more in-depth information and maps from the Grant-Platte Basin, visit the DNR Basin website: http://dnr.wi.gov/org/gmu/gpsp/gpbasin/
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