St. Croix Crossing
A shared project between the Minnesota and Wisconsin DOTs.
Location
Oak Park Heights, Minn., to St. Joseph, Wis.
Schedule
Construction is expected to begin in spring 2013 and will take approximately three years to complete.
Cost
Bridge=$280 million to $310 million
Total Project=$580 million to $676 million
Stillwater Lift Bridge
The Stillwater Lift Bridge is open
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Project Overview
The St. Croix Crossing, connecting Minnesota and Wisconsin, will replace the 80-year old Stillwater Lift Bridge with a four-lane bridge that will connect expressways on both sides of the river.
This major project will replace the 80-year-old Stillwater Lift Bridge with a four-lane bridge that will connect expressways on both sides of the St. Croix River. Currently, severe traffic congestion in downtown Stillwater causes pedestrian and traffic safety problems, which are amplified by current Lift Bridge operations.
The St. Croix Crossing project will provide a safer, more reliable river crossing. The project includes a four-lane river bridge, new roadway approaches on both sides of the river, historic and environmental mitigation, and extensive trail facilities (PDF) that will include converting the Lift Bridge to a bike and pedestrian facility. The project will provide jobs for suppliers, subcontractors, disadvantaged business enterprises as well as general contractors.
- St. Croix Crossing YouTube channel
- Engineering firm, HDR, chosen to lead bridge design (June 26, 2012)
- What is an extradosed bridge?
- View project layout from aerial view (PDF)
Bidding and Contracting
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Interested bidders can access information about the design build Hwy 36 project
- The plans and specs for SP 8221-82045A (Early Foundation Contract, St. Croix Crossing) were advertised on Jan. 11, 2013 for the March 1, 2013 letting. MnDOT Bid Letting.
Project Benefits
The project has been developed to protect and/or minimize impacts to the extensive historic and natural resources of the area. St. Croix Crossing balances community needs and improves quality of life for the region. It provides a sustainable solution for future generations by:
- Improving traffic safety and easing congestion in the St. Croix Valley
- Creating jobs and helping interstate commerce
- Protecting historic and scenic sites
- Preserving the historic Lift Bridge for use by bikes and pedestrians
Project Costs/Cost Sharing
MnDOT is the lead agency on this project and is coordinating and sharing costs with WisDOT. The project can be considered as three smaller projects with their own set of costs - the approach roads in each state and the bridge. The cost of the bridge, historic and environmental remediation, and project development are split evenly between the states. The cost of the Wisconsin and Minnesota approach roads will be paid for by the respective states. The current total project cost estimate range is from $571 million to $676 million and includes construction, right of way, environmental protection and remediation, contingency, bonds and insurance, engineering and management, etc.
It is also important to note that the project is using a total project cost estimate when citing costs, which adds in all ancillary expenses. Traditionally, only construction costs are reported when referring to project costs. The total project cost estimate provides a more accurate, and larger, view of the total cost. View the TPCE chart (PDF) for more details on projects costs.
Tentative Schedule
A foundation load test completed in summer, 2012 provided bridge designers with critical information on soil conditions under the river. Construction of the new bridge is expected to begin in 2013 and take about three years to complete. The approach roadways will also be built during this period.
Hwy 36 work includes:
- Reconstructing and realigning Hwy 36 and Hwy 95
- Adding turn lanes on both intersections at Oakgreen and Greely, as well as Osgood, to improve capacity
- Realigning the intersection of Oakgreen and Greeley to improve access points and motorists' safety
- Creating a shared center turn lane by converting the north and south frontage roads from two 12-foot lanes into three 11-foot lanes
- Adding a trail along the south frontage road to connect to the new loop trail
- Adding ponds to improve storm water treatment and water quality
- Creating access to Hwy 95 by connecting the south frontage road to Stage Coach Trail
- Realigning the Beach Road bridge to include bike and pedestrian trails
- Constructing noise and retaining walls
- Adding traffic signals, lighting, signing and pavement markings
- Implementing a new Intelligent Transportation Systems that includes cameras and traffic detection
- Relocating utilities
More information will be available after the contractor for the Hwy 36 approach work is selected in early spring.

