Region
Oregon
California, Northern
3
Crater Lake National Park
3
Crater Lake National Park (Or.)
3
California
1
Craters of the Moon National Monument
1
Craters of the Moon National Monument (Idaho)
1
Craters of the Moon National Preserve
1
Craters of the Moon National Preserve (Idaho)
1
Deschutes River Watershed
1
Idaho
1
Klamath National Forest (Calif. and Or.)
1
Lake County
1
Lassen Volcanic National Park
1
Lassen Volcanic National Park (Calif.)
1
Lava Beds National Monument
1
Lava Beds National Monument (Calif.)
1