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US 12: County NN Interchange

Design services are being provided for this project that will reconstruct the CTH NN interchange on US 12 outside the City of Elkhorn, WI. The interchange reconstruction will include a significant profile adjustment that will bring the roadway up to a desirable 60 mph design speed as well as increasing the vertical clearance over USH 12. All ramps at the interchange will also be reconstructed.

Pedestrian friendly features to be incorporated into the interchange design include an off-road path along the north side of CTH NN as well as on-road bicycle accommodations along both directions of travel.  DAAR is also responsible for preparing the Transportation Project Plat (TPP) needed to acquire the additional right of way due to interchange reconstruction.

Coordination with the local communities is a key component of the scope of services being provided by DAAR. To the east of the interchange Walworth County is pursuing a project that will reconstruct an adjoining section of CTH NN, including an extension of the off-road path along the north side. To the west of the interchange the city of Elkhorn is studying how the off-road path could be further extended into the city as well as the reconstruction of a small section of CTH NN. Both local projects would be packaged with the CTH NN interchange project to create one large construction letting, of which DAAR is responsible for coordinating and assembling.

Project Deliverables:

  • Project scoping, scheduling and budgeting

  • 30%, 60% (preliminary), 90% (final) and PS&E plans and documents

  • Preparation/coordination of Environmental Report (ER)
  • Utility coordination (Trans 220)
  • Right of Way Plat (TPP) preparation
  • Preliminary and final structure design
  • Public involvement
  • Drainage analysis and design