I-39/US 51 Interchange Reconstruction

Rothschild, Wisconsin

SRF prepared the final PS&E for this interchange reconstruction project in anticipation of a 2014 letting. The project consisted of interchange ramp re-alignments and the reconstruction of Bus 51 within the interchange area. SRF explored numerous ramp alignment alternatives and several different lane configurations on Bus 51 to improve operations of the interchange. Construction staging is also a major part of this project. SRF is preparing a Type III TMP to help manage traffic during construction.

Four retaining walls and one bridge on Bus 51 over Cedar Creek are being designed by the SRF team who has also been responsible for leading the project’s public involvement activities. In addition, SRF is designing three traffic signals along the Bus 51 corridor. These signals will employ flashing yellow arrow left-turn operations and monotube style mast arm signal poles. Two of the signals will be adjacent to at-grade railroad crossings, so special design considerations are being taken into account for driver safety and railroad operations. SRF is also developing railroad preemption timing for those signals near the railroad, in an effort to facilitate the clearance of queued vehicles on or adjacent to the tracks.

Water resource elements on the project include the crossing of Cedar Creek and complex storm sewer systems. The creek crossing was analyzed using HEC-RAS to determine waterway openings and to provide appropriate freeboard for the 100-year flood, all in an effort to keep the facility open during major flood events. Backwater from the Wisconsin River was taken into account in the design of the bridge and roadway embankment. A deep trunk storm sewer was designed to account for offsite drainage, high retaining walls, and challenging staging constraints.