Lunda opened the St. Croix River Crossing Bridge in Stillwater, Minnesota to traffic on June 16, 2017. The project included precast segmental approach bridges, which serve as ramps for the extradosed, segmental bridge, connecting Minnesota and Wisconsin over the St. Croix River. The main river bridge is 5,079 feet long and crosses 3,365 feet of water at heights ranging from 100 feet to 140 feet. It also includes 13 piers; seven on land in Minnesota, one in Wisconsin and five in the river. The bridge spans 600 feet between each pier in the river allowing high volume of marine traffic to flow through the waterway.

The St. Croix River Crossing Bridge Project utilizes many different engineering methods and designs, such as concrete box girder, stay cable, concrete segmental, balanced cantilever, post-tensioning, with pre-cast and cast-in-place sections for the bridge. The extradosed design, a hybrid of a concrete box girder and a cable-stayed structure, was selected to minimize environmental impact because it allowed the tower heights to be below the river bluffs, and meant fewer piers in the river.