STH 29 Fly-Over

PROJECT SUMMARY
STATE TRUNK HIGHWAY 29 FLY-OVER RAMP AT US51 – WAUSAU, WI 

Designer – GRAEF, Anhalt, Schloemer and Associates
Contractor – Zenith Tech

A fly-over ramp connecting eastbound State Trunk Highway 29 to northbound US Highway 51 carries an average daily traffic (ADT) of 1,400 vehicles.  It crosses over four lanes of USH 51 (designed for six lanes in the future) with an ADT of 56,100 vehicles.  The fly-over ramp consists of a superelevated single driving lane.  It is supported by twin trapezoidal fracture-critical curved steel tub girders.

Fish & Associates, Inc. provided a third-party investigation for the twin tub girders involving structural steel shop and field visual inspection to assess weld quality issues and whether final fabrication met the design requirements.


  • Location: Wausau, WI