Dubuque-area drivers crossing the Mississippi River between Iowa and Illinois are entering a period of notable transportation changes. The Iowa Department of Transportation (IDOT) is carrying out a significant multi-phase maintenance project on the Julien Dubuque Bridge, which carries U.S. Highway 20. Phase two of this effort will close both lanes of the bridge beginning Monday, July 6, 2026, with the full shutdown expected to last roughly one month until early August. 

This update follows the start of initial work on June 15. The overall project, valued at approximately $10.7 million, is anticipated to wrap up by mid-September and focuses on preserving the functionality of the historic crossing that has served the region since 1943. 

Breakdown of the Repair Phases

IDOT has organized the work into three distinct stages to balance necessary upgrades with traffic management:

•  Current Phase (June 15 through early July): Weekday daytime closures of the eastbound lane, typically from 6 a.m. to 3 p.m. Westbound traffic continues to flow. Evening, overnight, or weekend restrictions may occur as needed to keep the schedule on track. 

•  Full Closure Phase (July 6 onward): Both lanes will be unavailable for about four weeks. This represents the most impactful segment of the project for daily commuters and commercial traffic. 

•  Final Phase (Early August to mid-September): Daytime westbound lane closures, with westbound vehicles shifted into the eastbound lane where feasible. Eastbound drivers will use the established detour. Additional off-hour closures remain possible depending on progress. 

All timelines are provisional and could shift based on weather conditions, material availability, or on-site developments. Travelers should check 511ia.org or official IDOT channels for real-time alerts. 

Recommended Detour and Travel Adjustments

When the bridge is restricted, U.S. 20 traffic will be rerouted northward along U.S. Highways 61 and 151 to the Iowa-Wisconsin Bridge. From there, Wisconsin Highways 11 and 35 guide vehicles back to U.S. 20 near East Dubuque, Illinois. 

•  Expect an additional 10 to 15 minutes of travel time under normal conditions. 

•  The route adds distance and may see increased volume, particularly during rush hours or the full-closure period.

•  Commercial trucks and larger vehicles should verify any height, weight, or routing limitations in advance.

Scope of Construction Work

Crews are addressing several key elements to extend the bridge’s lifespan:

•  Repairing and replacing deck joints

•  Painting the steel superstructure

•  Applying deck sealants

•  Upgrading railings and pedestrian handrails

The bridge will remain off-limits to pedestrians and cyclists for the duration of the project. In response, the City of Dubuque has coordinated a free shuttle service operated by The Jule. Advance reservations (at least 24 hours ahead) are encouraged by calling 563-589-4196 to support those who rely on non-motorized crossings. 

Broader Community and Economic Effects

Local businesses near the bridge, especially in East Dubuque, have already begun feeling the pinch from the initial phase, with some reports of canceled reservations and reduced cross-river customer traffic. The upcoming full closure in July is likely to intensify these challenges for retailers, restaurants, and service providers that depend on convenient access. 

Daily commuters, freight operators, and emergency services will need to adapt schedules. Planners suggest combining trips, exploring flexible work hours, or using alternative crossings when practical. The detour’s added time and potential congestion underscore the importance of patience and preparedness.

Why These Repairs Matter

Carrying around 18,000 vehicles per day, the Julien Dubuque Bridge is a critical regional artery. The current work targets wear-and-tear issues common to infrastructure of its era, aiming to maintain safety and reliability well into the future. Discussions for a modern four-lane replacement bridge are ongoing, with potential timelines pointing toward the mid-2030s if funding aligns. 

This project forms part of a wider summer construction season across the tri-state area. While inconvenient in the short term, such investments help prevent larger disruptions down the road.

Practical Advice for Travelers

•  Monitor conditions frequently through official apps and websites.

•  Allow extra buffer time, especially during the full-closure window.

•  Consider carpooling or public transit options where available.

•  Support local businesses by planning visits around detour-friendly times when possible.

For project-specific questions, reach out to IDOT’s Manchester construction office at 563-927-2397. 

The Julien Dubuque Bridge has long symbolized connection in the Dubuque region. This maintenance period, though demanding, reflects a commitment to sustaining that link for generations ahead. Safe travels, and stay informed as work progresses.