Centerline to centerline, the two tunnels are approximately 115 feet apart at the east ventilation building entrance, 120 feet apart at the west ventilation building entrance, and some 230 feet at the widest point of separation under the mountain.
The length of the westbound (north) tunnel is 1.693 miles, and the length of the eastbound (south) tunnel is 1.697 miles (outside face to outside face of the ventilation buildings).
The average grade of both tunnels is 1.64 percent rising toward the west (rising 1.64 feet for each 100 feet on the horizontal).
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