County Road 9 Bridge Over I-494

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Final LayoutFinal Design Rockfork Road and I-494 Project

Project Overview
This project includes plans to replace the County Road 9 (Rockford Road) Bridge over Interstate 494 and improve the intersection. The project is a joint effort of the City of Plymouth, Hennepin County and Minnesota Department of Transportation.

View the final Project Layout (PDF).

Project Status
The city held an open house January 2019 to share draft plans and tentative construction schedules, receive feedback and answer questions. The project is set to begin in May 2019.

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 – May 13 to June 7
    Construction is tentatively set to begin May 13. Both north ramps will be closed (the ramp from County Road 9 to northbound I-494 and the ramp from southbound I-494 to County Road 9). The bridge will be open to traffic during this phase.

  • Phase 2 – June 10 to Sept. 27
    The County Road 9 bridge will be closed to traffic roughly 120 days – tentatively set for June 10 to Sept. 27 – weather permitting. Removal of the existing bridge is tentatively planned for the weekend of June 8-9, which may require the closure of I-494. After the completion of this phase, the new bridge will be open to traffic.

  • Phase 3 – Sept. 30 to Oct. 31
    During this phase, tentatively set for Sept. 30 to Oct. 31, both south ramps will be closed (the ramp from County Road 9 to southbound I-494 and the ramp from northbound I-494 to County Road 9). The new bridge will be open to traffic during this phase, but motorists may experience lane closures while crews complete the interchange. The anticipated completion date is Nov. 15 – weather permitting. 

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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