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A major wildlife crossing project in the Green Mountains is delayed indefinitely

An aerial view of the Green Mountains in the Waterbury region, with I-89 running through the valley.
Vermont Fish and Wildlife
/
Courtesy
The Interstate runs through a valley separating Mount Mansfield and Camel’s Hump and acts as a barrier to wildlife movement.

The state has walked back efforts to pursue a highly anticipated wildlife crossing project across Interstate-89 and Route 2. The crossing would have connected over 100,000 acres of protected land between Mount Mansfield and Camel’s Hump, in the middle of the Green Mountains.

For two years, state agencies have been working on plans to build the 150-foot-wide underpass in Waterbury after getting $1.6 million from the Federal Highway Administration for the design. It would replace a long, narrow culvert that runs several stories below the highway at Sharkeyville Brook, a tributary of the Winooski River.

Now, the project is on hold for the foreseeable future after the heads of the Agency of Transportation and the Agency of Natural Resources said � recently estimated to cost $50 million.

A map of the proposed wildlife crossing under I-89 and Route 2. It sits between the Mountain Mansfield habitat black and the Camels Hump habitat black.
In just over a decade, 18 bears, 15 moose, and dozens of deer have been killed along the section of highway between Bolton and Waterbury, according to state data.

“We get the value of this sort of infrastructure, but you have to be able to afford to build it,� said Joe Flynn, secretary of the Agency of Transportation.

The federal program to was created under the Biden administration and typically caps project funding at $25 million. The state says it doesn't have the money to cover the rest of construction, which would run millions more because of the cost of digging 50 feet beneath the road, meeting engineering standards, and traffic control on .

“This is a pretty expensive project to deliver and we can’t � the grant that's available is not enough to do the project,� Flynn said.

An artist's rendering depicts an underpass in a forest with a small stream running through it.
Vermont Agency of Transportation
/
Courtesy
An artist's rendering of the underpass project to allow fish and wildlife movement under I-89 and Route 2. Biologists have found bears in the state have distinct subpopulations north and south of the highway.

The culvert there today is about 5 five feet wide and almost 400 feet long. It was built in the 1960s, when the highway first opened. The state has almost no record of animals venturing through it.

“We had one mink go through the Sharkeyville culvert, once,� said Jens Hawkins-Hilke, a conservation planner with Vermont Fish & Wildlife. “It's a pinhole of light.�

But animals still look for passage along this stretch of road. It sits along the spine of the Green Mountains, a nearly continuous forest along the length of Vermont. The state has identified this region as vital to wildlife movement, particularly in response to climate change. On the side of I-89, the soil is packed down from a makeshift trail of bears, moose, deer, and other animals walking along the roadway.

“To us, that seems like looking for a place to cross, and not feeling comfortable,� said Hawkins-Hilke.

Water runs out of a metal culvert in the middle of the woods.
Jens Hawkins-Hilke
/
VT Fish & Wildlife
During big rains, water shoots out of the culvert in Waterbury and collects a pool of water.

And some do venture onto the highway. Over the past decade, dozens of bears, moose and deer have been killed by cars between Bolton and Waterbury.

There are : An undersized culvert about a mile to the west in Bolton and a passage beneath a bridge more than two miles away in Waterbury.

Neither are at the scale of the project proposed at Sharkeyville Brook, which would be big enough to accommodate large animals, fish and floodwaters.

“The Sharkeyville underpass would have been the biggest example in New England of anything like it,� said Kate Wanner, conservation director for the Trust for Public Land in Vermont and New Hampshire.

A photo from inside a long, narrow culvert.
Vermont Fish and Wildlife
/
Courtesy
The current culvert is around five feet wide and nearly 400 feet long. “It's a pinhole of light,� said conservation planner Hawkins-Hilke.

As of now, there’s no alternative plan for securing public funding to replace the culvert. The federal funding set aside for wildlife crossing projects , and the state has not identified other grant opportunities.

“That culvert in particular is not failing yet, so we have to take that into consideration,� said Flynn, with the Agency of Transportation. “We have over 300 large culverts like that on the interstate system in Vermont.�

But conservation groups are still pushing for the project, as many continue to work on protecting adjacent land.

“These highways were built with public money,� said Jim Shallow, with The Nature Conservancy.

“Our hope is that we can continue to have a public investment in making them safe for wildlife and for people.�

Lexi covers science and health stories for ¿ªÔÆÌåÓý. Email Lexi.

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