Iowa DOT News Release

Overnight closures on U.S. 20 in Dubuque begin February 11  

Posted on: February 04, 2019

MANCHESTER, Iowa – Feb. 4, 2019 – A project to set girders for the Dubuque Southwest Arterial (U.S. 52) bridge over U.S. 20 in Dubuque will require detouring eastbound U.S. 20 traffic onto North Cascade Road nightly from 10 p.m. to 5 a.m. Monday, Feb. 11, until 5 a.m. Thursday, Feb. 21, weather permitting according to the Iowa Department of Transportation’s Manchester construction office.

During this closure, traffic will be guided around the work zone by digital message signs and a marked detour. Westbound U.S. 20 will continue using the ramps to detour around the work zone as they have been for the last year. There will be no change to westbound traffic during the closure nights as they bypass the bridge. Local traffic may remain on U.S. 20 to reach residences up to Stone Valley Drive.

The Iowa DOT reminds motorists to drive with caution, obey the posted speed limit and other signs in the work area, and be aware that traffic fines for moving violations are at least double in work zones. As in all work zones, drivers should stay alert, allow ample space between vehicles, and wear seat belts.

The latest traveler information is available anytime through our 511 system. Visit; call 511 (within Iowa) or 800-288-1047 (nationwide); stay connected with 511 on Facebook or Twitter (find links at; or download the free app to your mobile device.

To receive email or text alerts about traffic incidents, road closures, traffic delays, and other restrictions that affect this highway route or other routes you travel, the Iowa DOT offers the “Your 511” option on It’s easy to subscribe to Your 511 and sign up to receive the email/text alerts. Visit for simple, step-by-step instructions.


Contact: Hugh Holak at 563-927-2397 or



Iowa highway in the evening