Status
Project construction continues on the I-495/I-90 Improvements project. The following activities are underway:
Ramp from I-90 Westbound to I-495 Southbound
- The new ramp connection from I-90 Westbound to I-495 Southbound is now open. Motorists on I-90 westbound will now have two exits to access I-495. The first exit will be for I-495 Southbound (Exit 106A), while the second exit will be for I-495 Northbound (Exit 106B). You can view the new alignment on this map.
Overnight Ramp Closures at I-495/I-90 Interchange
The I-90 eastbound ramp to I-495 northbound (exit 106) will be closed on Monday, May 18 and Tuesday, May 19 beginning at 11:00 PM each night to 5:00 AM the following morning. During the overnight closures, the following detour will be in place:
- When the I-90 eastbound ramp to I-495 northbound (exit 106) is closed, traffic will be directed to follow the detour signs and use I-495 southbound to exit 54A (West Main Street Hopkinton), to reverse direction back to I-495 northbound.
Additionally, the I-495 northbound ramp to I-90 eastbound and westbound (exit 58) will be closed from 11:00 PM on Tuesday, May 19 until 5:00 AM the following morning. During this overnight closure, the following detour will be in place:
- When the I-495 northbound ramp to I-90 eastbound and westbound (exit 58) is closed, traffic will be directed to follow the detour signs and use exit 59B (Route 9 westbound), to reverse direction back to I-495 southbound, then take exit 58 (I-90 eastbound and westbound).
Appropriate signage, law enforcement details, and messaging will be in place to guide drivers through the work area.
I-90 Eastbound Lane Shift
In July 2025, traffic on I-90 Eastbound was shifted from the previous alignment on the existing Whitehall Brook bridge to the south to facilitate the continued reconstruction of the Whitehall Brook bridge. Upon the completion of I-90 over MBTA Railroad phase 2, traffic on I-90 East will be shifted onto a different alignment extending the I-495/90 bridge to the Flanders Road bridge.
I-495 Northbound Lane Shift
Starting in December 2025, a new traffic pattern was implemented on I-495 northbound between Exits 58 (I-90) and 59 (Route 9). The updated configuration introduced a lane split around the new work zone:
- The right and middle lane pass to the right of the work zone.
- The left lane passes to the left of the work zone.
All three lanes remain on the highway through the split. Drivers who need to access Exits 59A and 59B should use the right two lanes. The traffic pattern change will remain in place through Summer 2026.
Overnight Ramp Closures at I-90/I-495 Interchange
- Ramps connecting I-90 and I-495 will be intermittently closed overnight, with detours provided. These closures will typically take place for two to four nights between the hours of 11:00 PM and 5:00 AM. We will make every attempt to provide notice of these closures via the project’s email list and on this page.
Overnight Lane Closures on I-90 and I-495
- Lane closures are ongoing during overnight hours. At least one lane in each direction on both I-495 and I-90 will remain open at all times.
Fruit Street Bridge
- Phase 1 of the construction of the Fruit Street Bridge was completed in 2024. Phase 2 of the Fruit Street Bridge construction process began in Summer 2024 and concluded in Fall 2025.
- Two-way traffic on Fruit Street reopened on December 11, 2025. Some bridge and sidewalk work is ongoing and is projected to be completed by Fall 2026.
Ramp from I-90 Westbound to I-495 Northbound
- Construction of the ramp deck, barrier, lighting, fencing and retaining walls is ongoing.
- The new ramp from I-90 Westbound to I-495 Northbound is anticipated to open in Summer 2026.
I-90 Construction
- Phase 1 of the 90 over Railroad Bridge structure is complete and the Design Build Team has progressed to the Phase 2 along the westbound shoulder. Westbound traffic on I-90 is anticipated to shift to the new Railroad Bridge structure in Summer 2026.
- Work over Whitehall Brook is ongoing. Phase 1 is complete. Traffic on I-90 westbound was shifted as part of Phase 2 in Fall 2025. Phase 2 is projected to be completed by Summer 2026. Phase 3, when traffic will shift to the median, will begin after the conclusion of Phase 2.
- The widening of the eastbound shoulder from Whitehall to the toll plaza is complete.
Old Toll Plaza/Ramp from I-90 East to I-495 North
- Installation of the culvert and I-90 eastbound to I-495 northbound substructure is ongoing and will continue through the end of the project.
Ramp from I-495 South to I-90 East
- The 495 over 90 Bridge superstructure construction is ongoing.
I-495 Traffic Crossover
- The project team has completed the 495 over Railroad superstructure and is completing barrier and pavement installation in support of the future Southbound traffic shift.
- The project team anticipates opening Exit 58 (from I-495 to I-90 Westbound) in Summer 2026. After Exit 58 is opened, I-495 Southbound traffic will be shifted out of the crossover to its final location. Additionally, I-495 Northbound traffic will be shifted into the crossover through Fall 2026.
Flanders Road Bridge
- Phase 1 of Flanders Road bridge construction was completed and opened in Fall 2024.
- Phase 2 substructure work is complete. The superstructure work is ongoing and is projected to be completed by Summer 2026.
Ramp from 495 North and South to I-90 West (Exit 58)
- Work has commenced on the permanent retaining wall along the northbound shoulder
- During the second stage of work on the bridge that carries I-90 over the Whitehall Brook, the ramps from I-495 northbound and southbound to I-90 westbound (Exit 58) will be reduced from two lanes to one lane through Summer 2026. The project team anticipates opening the new Exit 58 (from I-495 to I-90 Westbound) in Summer 2026.
- Approximately four weeks after new Exit 58 opens, the I-495 southbound alignment will shift to the new structure.
Construction activities are weather dependent and subject to change without notice.
Traffic and staging considerations
The project will involve complete replacement of the interchange. To avoid traffic impacts, the project will:
- Maintain 3 lanes on mainlines, except for short-term closures during approved off-peak hours
- Maintain all ramp connections between I-90 and I-495, including along temporary alignments
- Maintain proper signage and markings
- Provide temporary roadway lighting along ramps for safe nighttime travel
- Provision of safe construction access/egress
- Maintain resident and local business access/egress