St. Croix Crossing aerial view

St. Croix Crossing

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

St Croix Crossing logo

Causeway basics

A causeway is a structure built above the water level to act as a working platform, allowing construction materials, crew members and their vehicles to easily move back and forth between the shoreline and the pier. The causeway will be removed in 2016. The other river piers will be built from barges.

Purpose

  • Allows crews to build up Pier 8 without the need for barges.
  • Provides additional access onto the river to deliver supplies (concrete and reinforcement bar) so barges can then deliver them to all of the river piers.

Final look

The causeway is T-shaped. It stretches about 165 feet into the river and spans about 215 feet from Pier 8’s south foundation to its north foundation. It is 36-50 feet wide.

Environmental protections

The perimeter of the causeway is steel sheeting that is about 20 feet long and drilled into the bedrock. Inside the sheeting, the contractor has a protective fabric on the river bottom and will pile clean rock up to the desired height. Altogether, these safeguards prevent the rock from moving into the river. Materials and other planning for the causeway were carefully considered prior to its construction. This is a standard construction practice for river bridges.