Marys Rock Tunnel, Road tunnel in Shenandoah National Park, US.
The Marys Rock Tunnel extends 670 feet through solid granite on Skyline Drive at mile marker 32.2 in Shenandoah National Park.
Construction teams worked three shifts daily in 1932, using 500 pounds of dynamite twice per day to remove up to 15 feet of rock.
The tunnel stands as a testament to the engineering capabilities of the Civilian Conservation Corps during the development of national park infrastructure.
Vehicles must check their measurements before entering, as the tunnel maintains a strict clearance limit of 12 feet and 8 inches.
Workers drilled 40 holes measuring 12 feet deep into the rock face during each blast sequence of the tunnel construction process.
Location: Rappahannock County
Official opening: 1932
GPS coordinates: 38.65358,-78.31201
Latest update: September 23, 2025 16:44
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