Potomac River Guide Home

Interactive Maps

The Lower Potomac

The Potomac Estuary

Mount Vernon to Anacostia River

Mall Area

Georgetown to Great Falls

Potomac Piedmont

Upper Potomac

The North Branch

Boat Ramps

Monitoring Sites

Bridges and Ferries

Cruises and Charters

Search Potomac Sites

Also Explore

The Hudson River GuideThe Delaware River Guide

Indigo Tunnel

Historic Site

blank dot

The Western Maryland Railway built a 4,350-foot long tunnel through the Paw Paw bends to save a mile or more of track along the meandering Potomac River. The tunnel was abandoned in 1975 and was considered for an extension of the Western Maryland Rail Trail. However, the Maryland Department of Natural Resources identified a large colony of bats inside the tunnel, and in a preservation effort, has closed the tunnel and installed metal gates at each end of the tunnel.

Suggested Links

Click here for larger map and nearby sites.

Contact Information
National Park Service
142 W. Potomac St.
Williamsport MD 21795