The currently paved portion of the trail begins in downtown Bethesda, where the trail begins to turn south. It follows the Little Falls Branch to the Potomac River and the District line. It goes over the River Road Bridge and past the site of Fort Sumner, a Civil War-era fort. It then moves through the Dalecarlia area, traveling under the Washington Aqueduct conduit at the Dalecarlia Tunnel, past the Dalecarlia Reservoir and through the grounds of the Dalecarlia Treatment Plant over the Dalecarlia Bridge.