Sinking Major Utilities Beneath a River,
Replacing a Bridge


The City of Tomahawk, Wisconsin, needed to replace an aging bridge. But the bridge also carried phone, electric, natural gas, cable, water main and sewage force main utilities. The bridge would need to be replaced without interrupting service to the community.


The project team came up with a solution to sink multiple conduit packs, containing the different utilities, into a dredged trench along 700-feet of river bottom. After utilities were relocated, the bridge was replaced.


  • Solution allowed accelerated construction of new bridge
  • Improved safety and security of utility lines
  • Coordination with five utility owners, plus client and regulatory agencies
  • Improved aesthetics of new bridge
  • Utility relocation without service interruptions
  • Added capacity for future utility line installation


  • 2012 ENR Best of the Midwest Project | Engineering News Record Magazine

4th Street Bridge and Utility Relocation

Tomahawk, Wis.

City of Tomahawk


  • Civil Engineering
  • Environmental Engineering
  • Structural Engineering
  • Road and Street Design
  • Environmental and Construction Permitting
  • Construction Services
  • Community Engagement