v. 1. Missouri River between Camp River Dubois (Illinois) and Fort Mandan (North Dakota)--outbound 1804, return 1806 -- v. 2. Beyond Fort Mandan (North Dakota/Montana) to Continental Divide and Snake River (Idaho/Washington)--outbound 1805, return 1806 -- v. 3. Columbia River to the Pacific Ocean, and Further Columbia, Marias, and Yellowstone Explorations (Washington/Oregon/Idaho/Montana)--outbound 1805; return 1806