Pennsylvania Turnpike’s Allegheny Mountain Bypass Plan Faces Pushback in Somerset County
Why It Matters
Pennsylvania’s cross-state turnpike runs through the heart of Somerset County, and a proposal to permanently alter one of its most rugged stretches has ignited a debate over infrastructure priorities, eminent domain authority, and the preservation of one of the state’s most ecologically significant ridgelines. The outcome could reshape how the commonwealth balances aging highway maintenance against environmental and community costs.
What Happened
The Pennsylvania Turnpike Commission is advancing a plan to replace the aging twin-bore Allegheny Tunnel — which carries Interstates 70 and 76 through the eastern continental divide — by cutting a 1,000-foot-wide, 250-foot-deep gorge through the top of Allegheny Mountain. The proposal would reroute the highway entirely, eliminating the tunnel rather than renovating it.
Somerset County officials, conservationists, and residents gathered at the state Capitol this week to publicly oppose the plan, urging the commission, state lawmakers, and Gov. Josh Shapiro to pause the project and pursue alternatives with less environmental impact. Critics are calling for tunnel rehabilitation combined with construction of a third bore to expand capacity.
State Rep. Carl Metzgar (R-Somerset) has introduced legislation that would remove the commission’s authority to acquire land through eminent domain — a direct response to constituent opposition and the project’s potential impact on privately held land along the mountain. Much of the affected property belongs to the Mountain Field and Stream Club, a private organization that has opposed surrendering its land.
“It’s not my intent to punish them,” Metzgar said of the commission, “but to invite them back to the fold, to be good neighbors again.”
By the Numbers
- $300 million+ — Estimated cost of the proposed realignment and open-cut highway
- $600 million+ — Estimated minimum cost to add capacity within the existing tunnel structure, according to the commission
- 12 million cubic yards — Volume of rock that would be excavated to create the road cut
- 2,600 feet — Elevation at the project site, the turnpike’s highest point, where fog, ice, and high winds are common
- 30 years — Length of time the commission has been studying alternatives to the tunnel
The Two Sides
The Turnpike Commission argues that two decades of studies have consistently pointed to the tunnel itself as the core safety problem. The area has the highest crash rate on the system, and hazardous materials trucks are currently barred from the tunnel, forcing them onto smaller local roads. Commission Press Secretary Marissa Orbanek said eminent domain is a necessary tool for the agency to fulfill its legal obligations and that the realignment would produce a safer, seven-lane highway benefiting the entire state.
Opponents counter that the scale of destruction would be irreversible. Mark Kissel of Citizens to Save Allegheny Mountain noted that if the excavated rock were stacked on a football field’s footprint, it would rise more than a mile high. Environmental advocates warn the cut would damage wildlife migration corridors and degrade water quality in the surrounding watershed.
Sierra Club Pennsylvania Director Tom Schuster framed the stakes in broader terms: “This isn’t just about one project. It’s not just about Somerset County. It’s about what it means to live in Penn’s woods.”
Weather presents an additional concern. The tunnel currently shields drivers from the mountain’s most severe conditions. Opponents argue that an open trench would expose motorists to intensified wind, icing, and fog — the opposite of a safety improvement.
Zoom Out
The Allegheny Mountain dispute reflects a recurring tension in American infrastructure policy: aging mid-century highway infrastructure requires costly upgrades, but replacement projects increasingly face resistance over land use, environmental review, and community impact. States across the country have encountered similar conflicts as transportation agencies weigh the economics of rehabilitation against new construction. Eminent domain challenges have become a common legislative tool for communities seeking leverage in negotiations with state transportation authorities.
What’s Next
House Bill 2205, introduced by Rep. Metzgar, would need to advance through committee and pass both chambers before taking effect. The Turnpike Commission’s realignment plan remains in the preliminary design stage, with no construction timeline yet established. Pressure from Somerset County’s elected officials and advocacy groups is expected to continue, with calls for the governor’s office to intervene in the review process.