Allegheny Mountain Tunnel






"Allegheny Tunnel" redirects here. For the railroad tunnel of the name, see Gallitzin Tunnel.

Coordinates: 39°57′41.7″N 78°51′24.1″W / 39.961583°N 78.856694°W / 39.961583; -78.856694










































Allegheny Mountain Tunnel

Allegheny Mountain Tunnel.JPG
The tunnel’s western entrance

Overview
Location Somerset County, Pennsylvania
Route
I-70 / I-76 (Pennsylvania Turnpike)
Operation
Constructed 1939
Opened 1940 (present-day westbound tube); 1965 (present-day eastbound tube)
Character Twin-bore tunnel
Technical
Length 6,070 feet (1,850 m)

No. of lanes
 4 (two in each direction)
Highest elevation 2,314 feet (705 m)



Eastern entrance to the tunnel




Interior of the tunnel


The Allegheny Mountain Tunnel is a vehicular tunnel carrying the Pennsylvania Turnpike through the Allegheny Mountains. At this point, the Turnpike carries Interstates 70 and 76. When the tunnel was built, it was considered an "engineering marvel."[1]


The tunnel was built in 1939 and is used by 11 million vehicles annually today. Throughout the 2000s, state officials attempted to implement plans to replace the tunnel, citing its age.



History


The original Allegheny Mountain Tunnel was built in the late 19th century for the South Pennsylvania Railroad, which was never completed. This tunnel was not used due to concerns about its structural integrity.


The eastern end of this original tunnel can be seen by parking on the service road at the turnpike's eastern portal and walking up to the area just above and a bit north of the turnpike portal. The opening is visible in the rocks just uphill. Entering this old tunnel is prohibited.[2]


The current westbound tunnel was built in 1939 as part of the original construction for the highway. At first, this tunnel served both westbound and eastbound traffic with a single lane in each direction. The eastbound tunnel was completed in 1965 as part of an expansion and upgrade of the turnpike due to increased traffic volume. Both tunnels are approximately 6,070 feet (1,850 m) in length, making them the longest tunnels on the Pennsylvania Turnpike that are still in use (the bypassed Sideling Hill Tunnel is slightly longer, at 6,782 feet (2,067 m)).[3]Explosives and other hazardous materials are not allowed in the tunnels. Vehicles carrying these materials must exit before the tunnel and take other roads around the tunnel. Restrictions on some hazardous materials in non-bulk form have been lifted.[4]



Maintenance and replacement


Long term plans call for major maintenance to be performed on the tunnels; however, this presents a major problem for traffic.[5] Terrible backups prompted officials to build the second tube. With today's traffic volumes, it would not be feasible to close one tube and route all traffic through the other.


On October 22, 2013, WJAC-TV reported that the Pennsylvania Turnpike Commission had decided to replace the tunnel with either a new tunnel or a bypass. The reason for the replacement was that officials determined that the tunnel had reached old age and was becoming run-down.[6] By 2013, the original (westbound) tunnel was 73 years old, servicing approximately 11 million vehicles every year. A local hunting group called Mountain Field and Stream Club owns 1,000 acres of land around the tunnel, and the group had opposed plans to replace the tunnel in 2001. Possible plans include building a third tunnel, as well as bypassing the tunnels completely as was done for the Rays Hill and Sideling Hill Tunnels. On December 24, 2014, the PTC announced it was going forward with plans to replace the Allegheny Mountain Tunnel.[7]



References









  1. ^ Pierce, Paul (October 18, 2013). "Turnpike Officials to Present 6 Options to Fix Aging Somerset County Tunnels". Tribune-Review. Retrieved November 12, 2014..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  2. ^ "Pennsylvania Turnpike". Pennsylvania Highways. Archived from the original on June 6, 2009. Retrieved July 15, 2009.
    [self-published source]


  3. ^ "The World's longest Tunnel Page: Tunnels in USA". Home.no.net. March 19, 2009. Retrieved July 15, 2009.
    [self-published source]


  4. ^ "Transportation of Placarded Loads". Pennsylvania Turnpike Commission. Archived from the original on May 28, 2009. Retrieved July 15, 2009.


  5. ^ "The Pennsylvania Turnpike: Construction". Pennsylvania Turnpike Commission. Archived from the original on February 2, 2009. Retrieved July 15, 2009.


  6. ^ "Turnpike Commission Looking at Alternatives for Allegheny Mountain Tunnel". WJAC-TV Channel 6 News. Johnstown, PA: WJAC-TV. October 22, 2013. Retrieved November 12, 2014 – via YouTube.


  7. ^ "Pa. Turnpike Considers Plans to Replace Allegheny Tunnels in Somerset County". Pittsburgh Post-Gazette. December 24, 2014.










-

Popular posts from this blog

Italian cuisine

Image
"Italian restaurant" redirects here. For the television series, see Italian Restaurant. Some typical Italian gastronomic products in a window display in Imola Pizza is one of the world's most popular foods and a common fast food item Part of a series on the Culture of Italy History People Languages Traditions Mythology and folklore Mythology folklore Cuisine Festivals Religion Art Literature Music and performing arts Music Media Television Cinema Sport Monuments World Heritage Sites Symbols Flag Coat of arms Italy portal v t e Italian cuisine History Ancient Roman cuisine Medieval cuisine Early modern cuisine Contemporary cuisine Regional cuisines Apulian cuisine Lombard cuisine Neapolitan cuisine Roman cuisine Sicilian cuisine Venetian cuisine Cuisine of Abruzzo Cuisine of Sardinia Lists Chefs Dishes Pas...
Read more

Bulgarian cuisine

Image
Part of a series on Bulgarians .mw-parser-output .nobold{font-weight:normal} българи Culture Literature Music Art Cinema Names Cuisine Dances Costume Sport Public holidays in Bulgaria By country Albania Australia Canada Czechoslovakia Greece New Zealand Romania Serbia South America Turkey Ukraine United States Bulgarian citizens France Germany Hungary Italy Lebanon Lithuania Macedonia Spain United Kingdom Subgroups Anatolian Balkanian Banat Bulgarians Bessarabian Bulgarian Dobrujans Macedonian Ruptsi Balkandzhii Pomaks (Bulgarian Muslims) Thracian Shopi/Torlaks Şchei Religion Bulgarian Orthodox Church Islam Catholic Church Protestant denominations Language Bulgarian Dialects Banat Bulgarian Other List of Bulgarians People of Bulgarian descent v t e Tarator is a cold soup made of yogurt, water, minced cucumber, dill, garlic, and sunflower or olive oil (Chips are...
Read more

Carrot

Image
Root vegetable, usually orange in color This article is about the cultivated vegetable. For other uses, see Carrot (disambiguation). Carrot Scientific classification Kingdom: Plantae Clade : Angiosperms Clade : Eudicots Clade : Asterids Order: Apiales Family: Apiaceae Genus: Daucus Species: D. carota Subspecies: D. c. subsp. sativus Trinomial name Daucus carota subsp. sativus (Hoffm.) Schübl. & G. Martens The carrot ( Daucus carota subsp. sativus ) is a root vegetable, usually orange in colour, though purple, black, red, white, and yellow cultivars exist. [1] Carrots are a domesticated form of the wild carrot, Daucus carota , native to Europe and southwestern Asia. The plant probably originated in Persia and was originally cultivated for its leaves and seeds. The most commonly eaten part of the plant is the taproot, although the stems and leaves are eaten as well. The domestic carrot ha...
Read more