In a joint effort with Urban Systems, Ausenco was retained by the Ministry to carry out the design of the new Grouse Creek Bridge which carries Clearwater Valley Road across Moul Creek between Wells Gray Provincial Park and the town of Clearwater.
The south abutment of the existing bridge had washed away during a storm causing the bridge to collapse. The Ministry installed a temporary Bailey bridge on a detour immediately upstream of the existing bridge to enable the new bridge to be constructed clear of traffic.
We investigated options using standard prestressed twin cell concrete box girders, and steel I-girders with a concrete deck. The twin cell box girder option was found to be less expensive and was selected for detail design. Grouse Creek Bridge is a low volume traffic bridge and the Guidelines for the Design of Low Volume Road Bridges was applied to the design of the parapet railing, barrier flares and foundations. The bridge which uses standard 18 m long box girders with a membrane and asphalt pavement is supported on driven steel H-piles.
The 2-lane bridge has complex geometry due to a 30° skew, horizontal road curvature, longitudinal and traverse gradients and box beams that are not plumb.