 US 221/SR 135 crosses the Jeff Davis-Montgomery County Line at the foot of the Neal Lee Gillis Memorial Bridge, a long two-lane causeway over the Altamaha River.After the bridge, US 221/SR 135 only has intersections with a boat launching area and some minor dirt driveways until the blinker-light intersection with South Old River Road (Montgomery CR 150).Further north it passes through the eastern edge of Charlotteville.