The Allston Viaduct, which was built 60 years ago and carries the Mass Pike (I-90) from the Allston Interchange to the Commonwealth Avenue Bridge, is nearing the end of its useful lifespan, and must be replaced. The I-90 Allston Multimodal Project creates an opportunity to dramatically improve livability and connectivity for residents of the Allston neighborhood, while enhancing regional mobility and creating a new stop on the Worcester/Framingham Commuter Line to be known as West Station. As part of this project, the Commonwealth must decide how to carry the Mass Pike through the narrow strip of land between Boston University and the Charles River referred to as the throat—either on an elevated viaduct or at ground level. The All-At Grade design (officially titled the “Modified All At-Grade Option”) would tear down the highway viaduct and place the roadway at ground level. This design is supported by a wide array of regional stakeholders and offers a host of benefits discussed below. To learn more about the state's process, click here.

The All At-Grade design (officially titled the “Modified All At-Grade Option”) would tear down the highway viaduct, create new transportation mobility options, and activate and restore an underutilized section of the Charles River. It would also maintain weekday two-track Commuter Rail service throughout construction—and would be faster, cheaper, and less disruptive to build. The All At-Grade design would: remove the I-90 viaduct and place the roadway at-grade with no change in the number of travel lanes replace the narrow Paul Dudley White Path with a boardwalk with separated paths for walking and biking create a living shoreline to beautify and restore the riverbank Potential benefits include: Lower state maintenance costs Safer travel for commuters Continuous weekday two-track commuter rail service during construction Expanded transit, walking, and biking options Improved access to the Charles River Restored, resilient riverbank Enhanced public space and economic vibrancy To see additional design renderings, click here.

Dozens of business, environmental, transportation, elected, and community leaders support the All At-Grade design (officially called the "Modified All At-Grade Option"). Supporters of the All At-Grade design include: Senator Ed Markey Representative Ayanna Pressley Boston Mayor Marty Walsh Boston Chief of Streets and BPDA Director Boston City Council Boston University Cambridge City Manager Louis DePasquale Cambridge City Council Town of Brookline 19 Boston and MetroWest-area legislators 11 Worcester-area legislators Broad-based coalition of nearly 30 organizations and community leaders 350 MA Transportation Working Group A Better City Allston Brighton CDC Allston Civic Association Allston Brighton Health Collaborative Boston Cyclists Union Boston Society of Landscape Architects Brookline GreenSpace Alliance Cambridgeport Neighborhood Association Cambridge Redevelopment Authority Charles River Conservancy Conservation Law Foundation Fresh Pond Residents Alliance Kendall Square Association LivableStreets Alliance Magazine Beach Partners Massachusetts Bicycle Coalition Massachusetts Institute of Technology Massachusetts Sierra Club MassBio MASSPIRG Pioneer Institute TransitMatters Transportation for Massachusetts WalkBoston Worcester Chamber of Commerce Harry Mattison, Allston resident and I-90 Task Force Member Jessica Robertson, Allston resident and I-90 Task Force Member Fred Yaloris, Cambridge resident and I-90 Task Force Member To learn more, click here.

On October 6, 2020, the Massachusetts Department of Transportation (MassDOT) and the Federal Highway Administration accepted a version of the All At-Grade design that was championed by A Better City and the City of Boston to carry forward in the formal review process for the I-90 Allston Multimodal Project—it is officially called the “Modified All At-Grade Option.” On October 30, 2020, MassDOT closed a public comment period to solicit feedback on the three design options currently under review. On November 18, 2020, MassDOT announced that they will delay the selection of a Preferred Alternative design to carry forward in the environmental review process from November until summer 2021. MassDOT also indicated they may abandon the broader megaproject and instead pursue an approximately $200 million "Substantial Repair Option" to temporarily shore up the elevated Allston viaduct for 10-15 years. On March 18, 2021, MassDOT announced plans to accelerate up to $75 million in Phase I repairs to the Allston I-90 Viaduct. According to MassDOT, "This initial work is necessary for both the near-term safety of the viaduct and will support longer-term goals as the Commonwealth continues to work with stakeholders on design, mitigation, financing and permitting measures in advance of aiming to file a Notice of Project Change (NPC) for the preferred alternative later this year." On September 29, 2021, MassDOT announced it will begin to focus on advancing the Modified At-Grade design for the Allston Multi-Modal Project. Advancing this option will require an extensive effort with stakeholders and partner agencies, as well as the development of a comprehensive finance and mitigation plan, including securing anticipated federal infrastructure funding increases, local stakeholder contributions, and other potential funding options. MassDOT will not increase tolls for drivers on I-90 to finance the project. To learn more about this most recent development, click here. To learn more about the state's process, click here. On May 18, 2022, MassDOT announced it will be applying for federal funding through the Mega Grant Program to advance the I-90 Allston Project.