New Traffic Pattern IN EFFECT| Click for Details

Route 37 Improvements

  • Route 37 Improvements - Cranston, Warwick
    Route 37 to I-295 North - Cranston
  • Route 37 Improvements - Cranston, Warwick
    Route 37 Improvements - Cranston, Warwick
  • Pontiac Ave Bridge Deck
    Pontiac Avenue Bridge Deck - Cranston

The Project

Improvements to Route 37 will be made in three separate projects that will rehabilitate or replace 27 bridges and make safety and congestion improvements in this critical east-west freeway in central Rhode Island, linking the cities of Cranston and Warwick, major retail, office and residential areas, Interstate highways and Rhode Island T.F. Green International Airport. With a daily traffic count of 42,000 vehicles, Route 37 is one of the state's busiest corridors.

Built in the 1960s, this freeway's bridges are now deteriorating under increasing vehicular volumes and freight demands. Almost half of the Route 37 bridges are classified as being in poor condition."

We are grateful for the efforts of the Rhode Island's Congressional delegation in securing a $20 million TIGER grant for Phase 1, and a $21 million BUILD grant for Phase 2, and a $25 Million RAISE grant for Phase 3 to make these improvements possible.

Phase 1 – Bridge Group 51A

The first contract involves preservation, major rehabilitation, and/or reconstruction of 15 bridge structures between U.S. Route 1 (Post Road) in Warwick and the Pontiac Avenue interchange in Cranston. Six of these bridges are structurally deficient. Four of them will be replaced and the other two will be rehabilitated.

Project also includes safety improvements at the Pontiac Avenue interchange from Route 37 West, widening the highway and ramps to eliminate chronic congestion and improve safety.

Phase 2 – Bridge Group 51B and the Cranston Canyon

The second contract will rebuild six bridges and build one new bridge along the Route 37 corridor west of Pontiac Avenue in Cranston. But it also will make a number of improvements to improve safety and reduce congestion at the interchange of Route 37 and I-295 and along I-295 itself in the section commonly known as "Cranston Canyon" because of the rocky walls along the highway. These include:

  • Creating a third lane at I-295 North with new pavement and minor widening, which will work as an auxiliary lane from Route 37 heading north
  • Extending this auxiliary lane northbound to the Route 6 interchange in Johnston
  • Shifting the ramp from Route 37 East to I-295 North from the high-speed lane to the right lane, improving safety and reducing conflicting movements
  • Repositioning the ramp from I-295 North to Route 37 West to eliminate a conflicting weave
  • Widening the ramp from Route 37 West to I-295 North to improve sight lines and reduce crashes

Phase 3 – Bridge Group 51C Route 37 Right Size

The third contract  will replace and rehabilitate 6 bridges carrying Route 37 over local roads, arterials, and rail lines, removing two obsolete bridges, as well as right-sizing the highway corridor to ensure it meets Rhode Island's transportation needs today, as Route 37 was overbuilt as part of a proposed highway expansion project that was never constructed. Additionally, a new at-grade interchange at Route 37 and U.S. Route 1 (Post Road) will eliminate the overbuilt loop ramps and restore wetlands in the area. Pedestrian crossings on U.S. Route 1 (Post Road) and Route 2 (New London Avenue) will be enhanced as well as coordinating traffic signals along both corridors.

Learn More

Project Schedule & Cost

Phase 1 – Warwick, Cranston
  • Location: Cranston/Warwick
  • Start Construction: 2020
  • Finish Construction: 2025
  • Total Projected Cost: $81.8 Million
  • Detours Needed: Yes
Phase 2 – Cranston
  • Location: Cranston
  • Start Phase Construction: 2022
  • Finish Phase Construction: 2026
  • Total Projected Cost: $85 Million
  • Detours Needed: Yes
Phase 3 – Cranston/Warwick
  • Location: Cranston/Warwick
  • Start Construction: 2025
  • Finish Construction: 2028
  • Total Projected Cost: $142.8 Million
  • Detours Needed: Yes

NEW SERVICE ROAD OPEN

I-295 EXIT 3 A & B - NEW SERVICE ROAD TO ROUTE 37 WEST

Read the Latest Press Release

As part of the Phase 2 Cranston Canyon project, RIDOT built a new service road alongside I-295 North at the ramps for Route 37. This provides more room for traffic entering and exiting the highway in a separate lane from I-295 through traffic.

Additional Information & Graphics

Appendices D&E Test Pit and Soil Boring Logs
Appendix B Release Notification
Appendix C Phase I Environmental Site Assessment Report
Appendix F Laboratory Data Reports
Site Investigation Report 11-22-2022 Main Body
Phase 3 Project Summary Map
Phase 3 BG51C Public Notices - English
Phase 3 BG51C Public Notices - Spanish

DEM Environmental Report

As part of the above project, environmental investigation activities were performed along the shoulders and median of I-295 and on Cranston Street and the Washington Secondary Trail bike path to help guide soil management activities during construction and determine whether potentially hazardous materials are present in the areas where construction is being performed. Results of the environmental investigation have been compiled into a site investigation report that was submitted to RIDEM. A copy of the report is available for review below. For additional information regarding the environmental investigation or to make arrangement to review environmental records pertaining to this project, please contact Jeff Crawford at RIDEM at (401) 222-2797 x2777102

PROJECT UPDATES | AUGUST 7, 2026

Bridge Group 51C: I-295 to Pontiac Avenue and from Amtrak to Post Road

Effective Friday night, August 14, we're scheduled to make two traffic pattern changes on Route 1 (Post Road) under Route 37 in Warwick and along Route 37 under Glen Hills Drive in Cranston. The Route 37 East ramps onto Post Road North will be closed and traffic will be detoured onto new ramps the Department is building. All Route 37 East traffic will use a temporary traffic signal for access to either Route 1 North or South. This change will be in place until late summer/early fall. On Route 37 at the Glen Hills Drive Overpass, lanes will be shifted to the right, and a work zone will be created in the median area through early fall. Learn more.

Overnight next week on Wednesday and Thursday nights, from 8 p.m. to 5 a.m., we need to close the right lane for barrier and electrical work on Route 37 West in the area of Jefferson Boulevard, as well as Route 37 West over New London Avenue for equipment mobilization and concrete beam erection. During the same timeframe, New London Avenue below Route 37 be closed and have a signed detour in place.

During the daytime, curb and sidewalk work will continue requiring alternating lane closures on Post Road at Route 37, Tuesday – Friday, from 9 a.m. to 3 p.m.

Click here for the latest lane closure information