State

Rock Island State Trail

Illinois

Frontcountry Trail, Rail Trail

USDA Forest Service

Rock Lake Trail

Wisconsin

Backcountry Trail

Commission

Rock River Water Trail

Illinois, Wisconsin

National Water Trail

State

Rocky Knob Park Trail System

North Carolina

Backcountry Trail

U.S. Fish and Wildlife Service

Rocky Mountain Arsenal NWR Interior Trail System

Colorado

Backcountry Trail

U.S. Fish and Wildlife Service

Rocky Mountain Arsenal NWR Wetlands Loop Trail

Colorado

U.S. Corps of Engineers

Rocky Ridge Horse Trail

Mississippi

Backcountry Trail

City, Town, or County

Rocky River Reservation All Purpose Trail

Ohio

Frontcountry Trail, Urban Trail

State

Rocky Valley Trail

Arkansas

Backcountry Trail, Frontcountry Trail

USDA Forest Service

Rogue River Trail

Oregon

Backcountry Trail

National Park Service

Roosevelt Woods

New York

Backcountry Trail

State

Roughrider Trail

North Dakota

USDA Forest Service

Round Mountain

Oregon

Backcountry Trail

USDA Forest Service

Round Mountain

Colorado

Backcountry Trail

Bureau of Land Management

Row River Trail

Oregon

Backcountry Trail, Rail Trail, Urban Trail

USDA Forest Service

Ruby Crest Trail

Nevada

Backcountry Trail

U.S. Corps of Engineers

Running River Trail

Missouri

Backcountry Trail, Urban Trail

U.S. Fish and Wildlife Service

Rydell Refuge Trails

Minnesota

Backcountry Trail

USDA Forest Service

Sabbaday Brook Trail

New Hampshire

Backcountry Trail

City, Town, or County

Sac and Fox Trail

Iowa

Backcountry Trail