Dunlop Street Bridge Replacement (MTO Project)

Project Type
Roads
Stormwater & Creeks
Project #
EN1306
Status
In Progress
Estimated Completion
Fall 2028

This construction project is being led by the Ontario Ministry of Transportation (MTO) and is the final phase of the replacement of three bridges on Highway 400 at Dunlop Street, Anne Street and Sunnidale Road. During this approximately 4-year project, work will take place to construct a new expanded bridge crossing at Dunlop Street over Highway 400 and expand the interchange to accommodate future widening of Highway 400. 

Project Updates

July 8, 2026

The MTO has postponed the 30-day closure of the northbound Hwy 400 off-ramp to eastbound Dunlop Street West. The ramp closure is now expected to start Tuesday, August 4, 2026.

June 25, 2026

Construction on the new Dunlop Street West bridge is progressing well. As such, there is an upcoming 30-day long ramp closure of the northbound Hwy 400 off-ramp to eastbound Dunlop Street West (S-E ramp) as part of the construction staging. This closure is needed to complete grading of the new Dunlop Street alignment and interchange ramps. The closure is planned to begin Monday, July 20, 2026.

Signage will be in place on Hwy 400 in advance of the closure with a signed detour route that generally follows Essa Road, Anne Street and Dunlop Street West.

Project Details

The work includes: 

  • Replacement of the Dunlop Street bridge using staged construction methods to maintain travel on Dunlop Street throughout construction (i.e. new bridge will begin construction south of the existing bridge);
  • Lengthening the new Dunlop Street bridge to accommodate the future widening of Highway 400;
  • Widening the new Dunlop Street bridge to accommodate additional lanes on Dunlop Street as per the approved City of Barrie municipal class environmental assessment (i.e. 6-through lanes and active transportation infrastructure);
  • Realignment of all interchange ramps including intersection improvements;
  • Highway 400 median barrier replacement and drainage improvements;
  • Construction of a new stormwater management dry pond in the northeast quadrant of the bridge;
  • Replacement of two culverts along Dyments Creek;
  • Replacement of one culvert along Bunkers Creek;
  • Pavement resurfacing of Highway 400 from south of Dunlop Street to south of Sunnidale Road; and
  • Construction of a new noise wall along the Highway 400/Dunlop Street northbound on-ramp (i.e. at termination of Henry Street).

Upon completion of construction, Highway 400 will be reinstated back to a 6-lane configuration.

Anticipated Construction Schedule

Construction startMay 2025
Construction completionFall 2028

Traffic Impacts

Throughout the project there will be impacts to Dunlop Street, the interchange ramps, and mainline Highway 400, as well as an extended interruption to the Cedar Pointe Drive access from Dunlop Street. Notice of future traffic interruptions will be posted to this webpage.

More information can be found on the MTO Project Website. 

Aerial view of a highway ramp under construction.
Work progressing (June 2026)
Aerial view of construction on a new ramp
Progress on the interchange east of Hwy 400 including the new northbound on-ramp and noise wall (September 2025)
Aerial view of the Dunlop Street bridge
Work progressing (August 2025)
New Dunlop Street bridge and Highway 400 lane configuration

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