County Road 9 Bridge Advocacy

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Update: View open house and project status information at

The Purpose
To improve public safety and reduce congestion, the City of Plymouth is seeking $10.7 million in state bond funds to reconstruct the 53-year-old County Road 9 / Rockford Road bridge over I-494.

This vital interchange consists of a county road bridge over an interstate freeway, which was not completed during the I-494 project. Though it’s not city-owned  infrastructure, the city is advocating for funding from the state to finish the job.


Public safety hazard
A diamond interchange without dedicated left turn lanes, the bridge is the site of daily congestion and has averaged 33 crashes per year over the past five years.

The proposed diamond interchange will help improve public safety and traffic flow, and reduce congestion. 
Over capacity
Built in 1965, the bridge cannot accommodate existing traffic volumes and turning movements.
Problem: Current County Road 9 Interchange Solution: Proposed County Road 9 Interchange
Without dedicated left turn lanes, drivers must often wait for breaks in oncoming traffic to turn left onto I-494. Crashes occur when drivers veer from the left lane into the right through lane to avoid waiting. Rear-end and T-bone crashes are also common. The proposed diamond interchange features dual left turn lanes onto I-494 and two through lanes in either direction, as well as dual left turn lanes from exit ramps.


Proposed diamond interchange with dedicated left turn lanes
 Proposed diamond interchange (PDF)


Deteriorating County Road 6 bridge
Crumbling concrete and rusty rebar can be seen on both the surface and underside of the 52-year-old-bridge.

Crucial Infrastructure
Vital regional link
The interchange is a vital link to the regional transportation system. County Road 9 provides direct access to I-494, Highway 169, Highway 55 and Highway 100.

Barrier to economic development
The interchange plays an essential role in supporting the local and regional economy. However, congestion stifles business and job growth in this pivotal area of the region.

Aging infrastructure
Built in 1965, the bridge is approaching life expectancy and is visibly deteriorating.

 1964 - Undeveloped
Population: 14,000  |  Average daily traffic: 1,500
 2017 - Developed
Population: 75,000+  |  Average daily traffic: 39,140
 Map - Plymouth was undeveloped in 1965  Map - Plymouth development in 2017
When the County Road 9 bridge and I-494 were constructed in 1965, Plymouth was largely undeveloped and the interchange handled about 1,500 trips per day. Plymouth grew rapidly and the bridge quickly exceeded projected traffic volumes. While development in Plymouth continues, the County Road 9 bridge handles 26 times the traffic levels than when initially constructed – an average of 39,140 vehicles per day. It has the highest traffic volume of all similar bridges over I-494.

What Taxpayers are Saying
"Why wasn't this fixed when they updated 494?"
When MnDOT completed the two-year, $86 million I-494 Rehabilitation Project through Plymouth in 2016, many taxpayers were left wondering why the County Road 9 / Rockford Road bridge was seemingly forgotten.

What taxpayers are saying about County Road 9 bridge over I-494
What taxpayers are saying about County Road 9 bridge over I-494


Download the handout (PDF)

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