Winona Bridge CMGC

Perspectives

Ames Construction // Alternative Delivery // Winona Bridge CMGC

Project Location: Winona, Minnesota

Client: MnDOT

Synopsis of work:

The First CMGC Project in Minnesota.

This multi-phased project consists of building a new cast-in-place, balanced cantilevered segmental bridge upstream from the current bridge, followed by rehabilitation of the Warren through truss and reconstructing approach spans of the existing structure. The new bridge uses a concrete box girder design that is of comparable height and style that visually complements the iconic historic truss of the existing bridge. The two-bridge solution was a result of MnDOT working with the community to identify three primary goals for the project: keep the river crossing open, minimize financial burden on the city, and open the new bridge as soon as possible.

With urgency expressed for completion of this Mississippi River crossing, MnDOT chose Construction Manager/General Contractor (CMGC) procurement for the project—the first CMGC project in Minnesota. CMGC is an innovative alternative delivery contracting method that engages a construction manager during the design process. Using a phased plan with multiple work packages, CMGC allows new bridge construction to begin while still finalizing design.

The first four work packages for the new bridge and approaches were completed three months ahead of schedule and significantly under budget. The final work packages for rehabilitation of the existing bridge are planned for completion in 2019.

Click to enlarge any of the photos below:

Cast-in-place, balanced cantilevered segmental bridge—the first Minnesota CMGC project
CMGC allowed new bridge construction to begin while still finalizing design
New bridge design complements the historic truss of the existing bridge