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Rockford Road (County Road 9) Bridge Over I-494

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Rockford Road (County Road 9) bridge over I-494 fully open to traffic

Final Rockford Road bridge work begins Monday, March 30
Crews are set to begin the final work on the Rockford Road bridge over I-494 Monday, March 30. This work includes:

  • Installing fencing and railings
  • Removing the temporary pavement
  • Final soil restoration
  • Final paving of the roadway and trails
  • Permanent striping.

This work is expected to continue until June. The remaining work will require temporary lane shifts, but disruption to traffic should be minimal.

The City of Plymouth thanks area businesses, residents and motorists for their patience during the project.

Final LayoutFinal Design Rockfork Road and I-494 Project

Project Overview
This project includes plans to replace the Rockford Road (County Road 9) bridge over Interstate 494 and improve the intersection.

Project Overview Sheet (PDF)

The project is a joint effort of the City of Plymouth, Hennepin County and Minnesota Department of Transportation.

View the final Project Layout (PDF).

Pedestrian Bridge Closed
The pedestrian bridge is closed to traffic for the remainder of the project. Pedestrians and bicyclists should follow the posted detour route. Download the Pedestrian/Bicycle Detour Map (PDF).

Tentative Timeline
Weather permitting, the project will be completed in one construction season. Construction is set to begin in May 2019 and be finished in November 2019. Note: Due to the weather, some final work was delayed until spring.

To best accommodate access for nearby businesses and residents traveling the affected area, the project will be completed in three phases. View the Bridge Staging Maps (three phases) and Detour Routes (PDF).

All dates and timing of phases are tentative and weather dependent.

  • Phase 1 – May 28 through early July
    Construction is scheduled to begin in May. Phase 1, expected to be complete by early July, involves widening and improving the north ramps. Both north ramps will be closed (the ramp from Rockford Road to northbound I-494 and the ramp from southbound I-494 to Rockford Road). The roadway bridge will be open to traffic during this phase. Download the Phase 1 Detour Map (PDF)

  • Phase 2 – July 12 through early fall
    The Rockford Road bridge over I-494 is set to close July 12. The bridge will be closed to traffic for roughly 100 days. Removal of the existing bridge may require the closure of I-494 (nights/weekends). After the completion of this phase, the new bridge will be open to traffic. Download the Phase 2 Detour Map (PDF)

  • Phase 3 – Oct. 7 through late-November

    During this phase, the southeast ramp will be closed (the ramp from northbound I-494 to Rockford Road). While the new bridge will be open to traffic during this phase, motorists will experience lane closures and congestion while crews complete the interchange. The anticipated completion date is late November – weather permitting. Download the Phase 3 Detour Map (PDF) Note: Due to the weather, some final work was delayed until spring.

Note: The dates and timeline are subject to change.Staging map for the reconstruction of the County Road 9 bridge over Interstate 494

Background Information
The existing interchange was built in 1965 without dedicated left turn lanes – and the area has seen considerable development over the past 53 years. As a result, this interchange has experienced daily congestion and has averaged 33 crashes per year over the past five years. The proposed project would improve public safety and reduce congestion by constructing a wider bridge that can accommodate dedicated left turn lanes onto I-494.

Though the bridge is not city-owned infrastructure, the city has partnered with Hennepin County and MnDOT to complete the project.

Open House No. 1 – April 2018
An open house was held April 17, 2018 to display the preliminary plans. City, county and MnDOT staff were on hand to discuss options, receive feedback and answer questions on the proposed project. View the Open House Presentation Boards (PDF).

Open House No. 2 – January 2019
A second open house was held Jan. 16, 2019 to share draft plans for replacing the bridge and improving adjacent intersections, as well as associated traffic detours and construction schedules. Staff from the city, county and MnDOT were available to hear comments, take suggestions and answer questions. The following materials were displayed at the open house:

Plymouth City Hall | 3400 Plymouth Blvd. | Plymouth, MN 55447-1482
P 763-509-5500 | F 763-509-5510 |

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