Region
West (U.S.)
35
United States
17
Lewis and Clark National Historic Trail
14
Columbia River
8
Missouri River
8
Idaho
3
Missouri
3
Montana
3
Clearwater National Forest (Idaho)
2
Lemhi County (Idaho)
2
Northwestern States
2
Oregon
2
America
1
American Discovery Trail
1
Bird-Truax Trail (Idaho and Mont.)
1
Canada
1
Cape Disappointment State Park (Wash.)
1
Ecola State Park (Or.)
1
Fort Stevens State Park (Or.)
1
Great Plains
1
Hot Springs (Ark.)
1
Illinois
1
Kansas
1
Lemhi County
1
Lewis and Clark Back Country Byway and Adventure Road (Idaho)
1
Lewis and Clark National Historical Park (Or. and Wash.)
1
Lewis and Clark National and State Historical Parks (Or. and Wash.)
1
Lincoln National Historic Trail (Ill.)
1
Lolo Motorway (Idaho)
1
Lolo National Forest (Mont.)
1
North America
1
North Dakota
1
Northwest Coast of North America
1
Northwest, Pacific
1
Ohio River Valley
1
Ouachita River (Ark. and La.)
1
Rocky Mountains
1
Saint Louis
1
South Dakota
1
Southwest, New
1
Upper Missouri National Wild and Scenic River (Mont.)
1
Upper Missouri River Breaks National Monument
1
Upper Missouri River Breaks National Monument (Mont.)
1
Washington (State)
1
West Indies
1
Wyoming
1