Allegheny Mountain Tunnel
| County | Somerset |
|---|---|
| Length | 6,070 ft |
| Opened |
1 October 1940 (Opening of the Turnpike) |
| South Penn Railroad | |
| Number | 6 |
| Planned Length | 5,919 ft |
| Heading Completed | 3,946 ft |
Allegheny Mountain Tunnel is one of the original tunnels of the Pennsylvania Turnpike. Since the closing of Sideling Hill Tunnel, it is the longest Turnpike tunnel still in use.
History
The other six of the original seven Turnpike tunnels were built by completing the unfinished South Penn Railroad tunnels, but when the Turnpike survey examined the tunnel at Allegheny Mountain, it was deemed to be in poor condition, so a new tunnel was bored only a few yards away. In some photographs of the completed Turnpike tunnel, it is possible to make out the location just up the hill of the railroad dig.
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