Historical Tourism
- Lewis & Clark in Idaho at visitidaho.org
- Lewis and Clark Interpretive Sign Inventory
- Travel planner at lewisandclark.com
- The Lewis and Clark Trail (.com)
Clearwater National Forest
- Lewis and Clark: Clearwater National Forest
- Current travel and camping conditions
- Plants of the Lewis and Clark Trail
National Park Service
Native American Sites
- Umatilla, Walla Walla, and Cayuse (TrailTribes.org)
- Nez Perce (Lewis and Clark Rediscovery Project)
- Northern Shoshone and Bannock (TrailTribes.org)
L&C Trail Heritage Foundation Sites
- Lewis and Clark Heritage Trail Foundation (Parent organization)
- Washington Chapter
- Oregon Chapter
- Portage Chapter (Great Falls, MT)
- Travelers' Rest Chapter (Missoula/Lolo, MT)
Research
- Complete Journals by Moulton
- Steve F. Russell Research Archive
- Online Texts at University of Nebraska Press
- Westbound Google Map Part 1 (Pittsburgh, PA to Fort Mandan)
- Westbound Google Map Part 2 (Fort Mandan to Fort Clatsop)
- Eastbound Google Map (Fort Clatsop to St. Louis)