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Mass. Pike project in Allston to cost $1 billion or more

The plan to alter the route of the Massachusetts Turnpike through the Allston stretch could reshape the neighborhood. Above: The highway makes a pronounced curve to avoid the site of a former rail yard. –David L. Ryan/Globe Staff

A mammoth highway project that would dramatically reshape the Massachusetts Turnpike in Allston and affect the commute of hundreds of thousands of motorists will move forward and likely break ground in 2020, state officials said Monday.

The project, with one plan estimated to cost $1.2 billion, would replace a raised portion of the Pike between Boston University and the Charles River and straighten the roadway where it takes a looping bend through now-abandoned rail yards. As part of the construction, the state would build another commuter rail station, remove the labyrinth of twisting ramps and access roads, and create a more orderly grid with new streets, bike and walking paths, and possibly more parkland along the Charles River.

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The planned changes to the Allston Interchange, as it is known, are a “generational opportunity to use the space available to get the interstate right, get the road network right, and get the rail system right,’’ Transportation Secretary Stephanie Pollack said Monday, in detailing the state’s intent to submit construction and environmental plans by the end of the month.

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