East Portal: (Satellite, 84 photos)
West Portal:
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| Street View, Aug 2022 |
East Portal:
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| Street View, Aug 2022 |
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| Historical Hive posted The Cumberland Gap Tunnel: A Marvel of Modern Engineering Nestled in the heart of the Appalachian Mountains, the Cumberland Gap Tunnel is a remarkable feat of engineering that seamlessly blends modern infrastructure with the natural beauty of the region. Completed in 1996, this impressive tunnel runs beneath the historic Cumberland Gap, a natural break in the mountains that once served as a vital passageway for early American pioneers. The construction of the Cumberland Gap Tunnel was an ambitious project aimed at preserving the historical and environmental significance of the Cumberland Gap while improving transportation safety and efficiency. Before the tunnel's construction, U.S. Route 25E, which traversed the gap, was a narrow, winding road fraught with hazards. The tunnel now provides a safe, direct route, significantly reducing travel time and accident risk. Construction on the project began in 1991. Engineers and construction crews faced the daunting task of boring through the Cumberland Mountain, a process that involved drilling and blasting through solid rock. The tunnel stretches 4,600 feet and consists of twin bores, each accommodating two lanes of traffic. This design ensures a smooth flow of vehicles in both directions, minimizing congestion and delays. Cumberland Gap Tunnel is also notable for being one of only two tunnels in the United States to begin in one state and end in another, sharing the honor with the East River Mountain Tunnel crossing Virginia and West Virginia. The Cumberland Gap Tunnel crosses begins in Kentucky and ends in Tennessee, or vice versa depending on which way you enter. Some say you even touch on a third state (Virginia) while passing through the tunnel. Additionally, a visitor center was established to educate the public about the region's cultural and natural history. The successful completion of the Cumberland Gap Tunnel stands as a testament to innovative engineering and a commitment to preserving America's natural and historical heritage. Today, it not only facilitates efficient transportation but also enhances the visitor experience to this storied region, allowing travelers to explore the same path once tread by Native Americans, explorers, and pioneers. Whether you're a history enthusiast, an engineering aficionado, or simply a traveler passing through, the Cumberland Gap Tunnel is a marvel worth appreciating. It embodies the spirit of progress while honoring the past, ensuring that the legacy of the Cumberland Gap continues to inspire future generations. Rob Little posted The Cumberland Gap Tunnel: A Marvel of Modern Engineering Nestled in the heart of the Appalachian Mountains, the Cumberland Gap Tunnel is a remarkable feat of engineering that seamlessly blends modern infrastructure with the natural beauty of the region. Completed in 1996, this impressive tunnel runs beneath the historic Cumberland Gap, a natural break in the mountains that once served as a vital passageway for early American pioneers. |
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| Marvin Meyers posted Early Fall photograph of the Claiborne County Tennessee entrance to the Cumberland Gap Tunnel on Highway 25E. |
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| Marvin Meyers posted Construction of the Cumberland Gap Tunnel |
The first pilot tunnel was drilled in the early 1980s. It " revealed many characteristics of the mountain that would later pose challenges in excavation. Thick clay infillings, limestone formations, and caves, along with underground streams and a lake were encountered. Numerous underground streams were a major challenge as well." In 1985, a second pilot tunnel was drilled to better understand the inner geology of the Cumberland Mountain. Construction began on June 21, 1991. "The former US Route 25E alignment through Cumberland Gap was removed in 2002 and the land recontoured as to resemble the original wagon trail at the cost of $5 million. The National Park Service utilized tons of rock excavated from the tunnel to reshape the topography of the trail as to what it resembled in the 1700s." The tunnel construction used blasting rather than TBMs. [B&T]
Spending $5 million to erase the old highway explains why I could not find it on a satellite map.
The tunnel itself cost $280m, twice the original estimate. [fha]
Since it was drilled and blasted rather than dug with a TBM, the shape was a more efficient horseshoe rather than a circle.
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| cgtunnel |
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| 20th of 59 photos |
At least one end used cut-and-cover.
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| 43rd of 59 photos |
dr-sauer has some construction photos with an emphasis on the lining.
The Old Wilderness Road:
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| 1991 Middlesboro South @ 24,000 |
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