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

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Rockford Road/I-494 Bridge Project Phase 1 Detour Map -- Primary detour route is I-494 and Highway 55. Local traffic detour routes include Highway 55, Northwest Boulevard (County Road 61) and Rockford Road (County Road 9).Phase 1 Begins May 28
Phase 1: North Ramps Closed 
Both north ramps are closed, as of Tuesday, May 28.

Phase 1, which is expected to be complete by early July, involves widening and improving the north ramps.

The north ramps include:

  • The ramp from Rockford Road (County Road 9) to northbound I-494
  • The ramp from southbound I-494 to Rockford Road

The roadway bridge will continue to be open to traffic during Phase 1.

Phase 1: Detour
Motorists should follow the posted detour route. The primary detour for this phase is I-494 and Highway 55.

Local traffic detour routes include Highway 55, Northwest Boulevard (County Road 61) and Rockford Road (County Road 9). Download the Phase 1 Detour Map (PDF).

Pedestrian Bridge Closed
The pedestrian bridge is closed to traffic, as of May 30. It will be closed for the remainder of the project. Pedestrians and bicyclists should follow the posted detour route. Download the Pedestrian/Bicycle Detour Map (PDF).

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).

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.

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 – Spring through early summer
    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 – Summer through early fall
    The Rockford Road bridge will be closed to traffic for roughly 100 days. Removal of the existing bridge is tentatively planned in June, which may require the closure of I-494 (nights/weekends). After the completion of this phase, the new bridge will be open to traffic.

  • Phase 3 – October through late-November

    During this phase, both south ramps will be closed (the ramp from Rockford Road to southbound I-494 and the ramp from northbound I-494 to Rockford Road). While the new bridge will be open to traffic during this phase, motorists may experience lane closures while crews complete the interchange. The anticipated completion date is late November – weather permitting.

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:

Contact
Engineering
Plymouth City Hall | 3400 Plymouth Blvd. | Plymouth, MN 55447-1482
P 763-509-5500 | F 763-509-5510 | engineering@plymouthmn.gov

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