St. Croix Crossing aerial view

St. Croix Crossing

Connecting Oak Park Heights, Minn. and St. Joseph, Wis.

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Lunda/Ames Joint Venture to begin constructing St. Croix Crossing bridge superstructure

Pile driving starts in mid-December at seven pier locations on Minnesota land

Dec. 5, 2013

STILLWATER, Minn. – The Minnesota and Wisconsin departments of Transportation this week approved a $332.5 million contract with the Lunda/Ames Joint Venture to construct the St. Croix Crossing bridge superstructure.

Lunda/Ames will begin mobilizing the week of Dec. 9 and start driving pile later this month. The focus during winter 2013-14 is pile driving for the seven pier locations on Minnesota land. The piers will support the Highway 36 approach bridge and ramp bridges that connect to the main river crossing.

Pile driving will occur between 7 a.m. and 7 p.m. up to six days per week. Crews will not work Sundays. Pile driving at this location will continue through May 2014. Work on the bridge construction will continue through 2016.

Area residents and businesses may hear repeated banging noises and feel vibrations while the equipment drives piling into the ground. To mitigate impacts, MnDOT required the contractor to complete as much pile driving as possible during the colder winter months while windows are closed and fewer people are outdoors.

Construction components in this superstructure contract include:

  • Extradosed-type bridge
  • Ramp bridge from Highway 95 to the river crossing (south of main bridge)
  • Ramp bridge from the river crossing to Highway 95 (north of main bridge) 
  • Highway 36 box girder approach bridge
  • Connecting structure between the river bridge and the Highway 36 approach bridge

The construction cost of $332.5 million plus the time value component created the $380.3 million bid announced in November. As part of its bid, Lunda/Ames Joint Venture committed to completing all contract components in 956 calendar days—with planned completion of the bridge in late-summer 2016. In the A plus B bidding process, those days were valued at $47.8 million. By law, bid specifics cannot be announced until a contract is awarded. For more information about A + B bidding, visit:

The total project cost remains at $580-$676 million. This includes seven miles of expressways on either side of the bridge in Minnesota and Wisconsin, as well as an extensive trail facility for pedestrians and bicyclists and historic/environmental mitigation efforts.

The extradosed bridge design is a hybrid of a concrete box girder structure—like the I-35W St. Anthony Falls Bridge in Minneapolis—and a cable-stayed structure—like the Hennepin Avenue bridge in Minneapolis. It is lower in height than a typical cable-stayed bridge. The bridge design minimizes environmental impacts by keeping tower heights below the river bluffs and reducing the number of piers in the river to five. When completed, the St. Croix Crossing will be the second extradosed bridge in the United States; the first extradosed bridge is located in Connecticut.

Maps, renderings, videos and other information are available at

Media availability

Jon Chiglo, St. Croix Crossing project director, is available to answer questions. Contact Jessica Wiens at 651-366-4272 (office) or 651-503-0637(cell) to coordinate.

Project information

The Minnesota highway approach project will be complete by fall 2014. The Wisconsin approach project will be complete by fall 2016. When all work is finished, motorists will have smoother highway pavement surfaces, improved flow at intersections, an improved frontage road system in Oak Park Heights and a new river crossing between Minnesota and Wisconsin. All of this will occur while maintaining or restoring the area’s cultural, historic and environmental resources.

Stay connected, ask questions or provide comments to the St. Croix Crossing project team:

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