The Iowa Department of Transportation (DOT) has begun preliminary construction work for the replacement of the U.S. Highway 20 bridge over Catfish Creek in Dubuque.

Starting on the evening of Sunday, Sept. 28, DOT crews began construction of median crossovers on U.S. 20. Overnight lane closures will be in place from 7 p.m. to 6 a.m. on Sunday through Thursday nights for up to six weeks. Work will be performed in an area roughly bordered by N. Crescent Ridge on the west and Century Dr. on the east.

As a result of the work, the U.S. 20 intersection with Century Drive will be closed, with the exception of all right-turn lanes at the intersection.

Motorists are reminded 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 DOT’s Catfish Creek bridge replacement project includes construction of a new bridge, the addition of new bridge approaches with wider shoulders, and installation of new guardrails. Construction of the new bridge is expected to begin in the spring of 2026.

Questions regarding the project can be directed to Resident Construction Engineer Hugh Holak of the Iowa Department of Transportation by emailing hu********@*****ot.us or by calling 563.927.2397.