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The Robertson Tunnel is a twin-bore light rail tunnel through the Tualatin Mountains west of Portland, Oregon, United States, used by the MAX Blue and Red Lines.The tunnel is 2.9 miles (4.7 kilometers) long [1] and consists of twin 21-foot-diameter (6.4 m) tunnels.
East River Mountain Tunnel, twin tunnels, I-77, between Bland County, Virginia and Mercer County, West Virginia; Greenwood Tunnel - 535.5 feet (163.2 m) - Chesapeake and Ohio Railway near Greenwood, abandoned; Hampton Roads Bridge-Tunnel, Interstate 64 beneath Hampton Roads between Hampton and Norfolk
It is located in the Appalachian Mountains near Duffield in Scott County, Virginia. The Natural Tunnel, which is up to 200 feet (61 m) wide and 80 feet (24 m) high, [ 1 ] began to form more than a million years ago when groundwater bearing carbonic acid percolated through crevices and slowly dissolved limestone and dolomite bedrock .
Little Cobbler Mountain (North Cobbler Mountain) – Elevation 1,447 ft (441 m) Big Cobbler Mountain (South Cobbler Mountain) – Elevation 1,562 ft (476 m) 38°50′19″N 77°57′10″W / 38.8387°N 77.9528°W / 38.8387; -77.9528 ( Big Cobbler Mountain (South Cobbler Mountain
Recent maps identify the mountain as “Walker Mountain”, but it is often referred to by the name “Big Walker Mountain”. Route 52 crosses Walker Mountain passing by Big Walker Lookout at the crest. Interstate I-77 passes under Walker Mountain in Big Walker Mountain Tunnel. There are many roads giving access to the area.
The Vista Ridge Tunnels are highway tunnels through the Tualatin Mountains ("West Hills") of Portland, Oregon, United States. Located in the Goose Hollow neighborhood, [ 1 ] the tunnels pass through a hillside locally known as Vista Ridge which is a half mile (1 km) west of downtown Portland.
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Colonial Parkway, Williamsburg Tunnel 1949 1988 Colonial Parkway: Colonial Williamsburg: Williamsburg: Independent city: VA-119: Skyline Drive, Marys Rock Tunnel: 1932 1996 Skyline Drive: Mary's Rock: Luray: Rappahannock County