Traffic and construction updates - I-495/I-90 Interchange improvements

Improving safety and addressing traffic conditions at the interchange of I-495 and I-90

Status

Project construction continues on the I-495/I-90 Improvements project. The following activities are underway:

Overnight Ramp Closures at I-90/I-495 Interchange

• From 11:00 p.m. on Monday, July 14, to 5:00 a.m. on Tuesday, July 15:
  • The ramp from I-495 to I-90 westbound (exit 58) will be closed. Traffic will be directed to follow detour signs in place and use I-90 eastbound to exit 111 (Route 9 Framingham) to reverse direction back to I-90 westbound.
  • The ramp from I-90 eastbound to I-495 northbound will be 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.   
• From 11:00 p.m. on Tuesday, July 15, to 5:00 a.m. on Wednesday, July 16:
  • The ramp from I-90 eastbound to I-495 southbound (exit 106) will be closed. Traffic will be directed to follow the detour signs and use the ramp to I-495 northbound to access I-495 southbound.
• From 11:00 p.m. on Wednesday, July 16, to 5:00 a.m. on Thursday, July 17:
  • The ramps from I-90 eastbound and I-90 westbound to I-495 southbound will be closed. Traffic will be directed to follow the detour signs and use I-495 northbound to exit 59B (Route 9) to reverse direction back to I-495 southbound.
• From 11:00 p.m. on Thursday, July 17, to 5:00 a.m. on Friday, July 18:
  • The I-495 southbound on-ramp (exit 106) from I-90 will be closed. Traffic will be directed to follow the detour signs and use I-495 northbound to exit 59B (Route 9 westbound), to reverse direction back to I-495 southbound.

The ramps are expected to be reopened by 5:00 a.m. on Friday, July 18.

Ongoing 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 will continue until Fall 2025.

Ramp from I-90 Westbound to I-495 Northbound:

• Steel erection has commenced, and superstructure construction will occur through Spring, 2026
• Shoulder widening along I90 Westbound has commenced.

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.
• Work on the I-90 westbound off ramp to I-495 South superstructure continues.
• Work over Whitehall Brook is ongoing. Substructure and foundation work is complete, and traffic will be shifted to the completed Stage 1 in July.
• The widening of the eastbound shoulder from Whitehall to the toll plaza is complete.

Old Toll Plaza:

• Installation of the culvert and I-90 eastbound to I-495 northbound substructure is ongoing.

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.

Flanders Road Bridge

• Phase 1 of Flanders Road bridge construction was completed and opened in Fall 2024. Phase 2 substructure work is complete, and the superstructure work is ongoing.

Ramp from 495 NB to 90 WB

• Work has commenced on the permanent retaining wall along the NB shoulder

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