Western Watershed Boundaries

Map of the Continental Divide and the Great Basin Divide

Contributed by Steve F. Russell

This map shows the most significant Western watershed boundaries in the United States, the Great Continental Divide, and the Great Basin Divide. These watershed boundaries were drawn with great accuracy based on USGS topographic maps. Water does not flow out of either the Great Basin or the Great Divide Basin.

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Topics

Google Maps Route Center Line Lewis and Clark Trail Oregon-California Trails Lolo Trail Nee-Me-Poo National Historic Trail Mullan Road Other Trail Inventory Bird-Truax Trail Fur Trade Carroll Trail Methodology Old North Trail The Wilderness Road

Contributors

Steve F. Russell Kristopher K. Townsend US National Park Service (LCNHT) Robert H. Dunsmore Richard S. Buswell Merle Wells Larry Jones John (Jack) P. Harlan Martin Plamondon II James D. Harlan Ralph Saunders David and Sue Eakin Raymond Borchers