I-41/US 45 Diamond Grinding Projects

Milwaukee and Washington Counties

US 45 Resurfacing Washington County


Pavement resurfacing will take place along US 45 from the I-41/ US 45 split to Paradise Drive, and pavement replacement will take place along northbound US 45 from Paradise Drive to just north of County D in Washington County.

Project Improvements

Work will include:

  • Grading
  • Base patching
  • Concrete pavement repair
  • Diamond grinding
  • Milling
  • Asphalt pavement
  • Median cable guard
  • Guard rail
  • Erosion control
  • Bridge rehabilitation at four locations


Construction is expected to begin mid March and be complete in late November 2021. Schedule is weather dependent and subject to change.

Traffic Impacts

Spring/Summer – I-41 to County D

  • US 45 will remain open to traffic with exceptions of overnight closures associated with pavement repairs and paving.
  • US 45 will be open in both directions during peak travel hours.
  • Project will include intermittent and off-peak hour or overnight lane and ramp closures to complete pavement repairs.
  • Project will also include overnight full closure and detour of US 45 to complete asphalt paving and pavement repairs.
  • All overnight full closures and detours of US 45 will be posted in advance of operations.

Mid summer through Fall – Paradise Drive to County D

  • From Paradise Drive to County D, traffic on northbound US 45 will be crossed over to the SB roadway.
  • The department will maintain a single lane of traffic in both directions while pavement on northbound US 45 is removed and replaced.
  • During replacement of northbound pavement between Paradise and County D, the entrance ramps to northbound US 45 from Paradise Drive and WIS 33, and the northbound exit ramp to WIS 33 and County D will be closed. The posted speed limit will be reduced to 55 mph from Paradise Drive to County D during construction.
  • There will be no full overnight closures of US 45 during the Washington County Fair.

Closures and updates

Traffic on US 45 northbound from Friendly Drive to Paradise Drive was switched over to the single inside southbound lane the week of 7/26. Crews will be laying new concrete pavement along US 45 northbound from Paradise Drive to County D and installing cable barrier in the median beginning mid-September. View project update HERE.

US 45 ramp closures through late October:

  • County PV entrance ramp to US 45 southbound
  • Northbound entrance ramp from Paradise Drive
  • Northbound exit/entrance ramps at WIS 33
  • Northbound exit ramp to County D

Note: See closures page for more information. 


  • View US 45 detour (WIS 33 to WIS 60)  HERE.
  • View County D to US 45 southbound on-ramp detour route HERE.
  • View WIS 33 and County D northbound off-ramp detour route HERE.