This is a bridge that I know very little about. It was built by the Chicago, Milwaukee, Saint Paul, and Omaha Railroad, which became the Chicago & North Western, which is now the Union Pacific Railway. The railroad bridge at this location dates back to 1872, but likely has been upgraded or replaced since then. The bridge is still in operation, and it frequently opens and closes in the summertime.

This bridge is located in an area of the Saint Croix where sandbars naturally occur. The bridge is located close to the Minnesota shore, and connects to a long causeway built across a relatively wide part of the Saint Croix river. On the Wisconsin side, the causeway branches off into two different wye-configurations. One branch of the second wye runs along the river shore, crossing a dam that holds back a tributary of the river. The river crossing paths vary from 3,150 feet to as much as 4,550 feet. Only one path currently has rails, and that supports the UP mainline. That path is approximately 3,922 feet. Each of the four paths coming out of the two wye junctions has a small bridge where it connects to the Wisconsin shore.

The photo above was taken from the old US-12 causeway that is part of the old highway toll bridge that once connected Minnesota and Wisconsin. The view is looking northwest towards the Minnesota shore on the west side of the river. The photo below is looking north towards the swing span as seen from a riverside park on the Minnesota side of the Saint Croix River.

These two photos are views looking southeast from the edge of the river bluffs just off of Minnesota highway MN-95. The photo above is the swing span, which is in the open position. The photo below are the two fixed bridges spans. The larger is a through truss, while the shorter span is a pony truss. The land directly behind the bridge is a natural sandbar. The causeway in the background is the roadway leading to the old US-12 toll bridge.

These two photos are more views from the river bluffs on the Minnesota side of the river. The photo above is an overview of the bridge spans. The photo below is a view of the railroad causeway leading leading to the bridge from the Wisconsin side of the river.

The photo above is the north side of the C&NW bridge as seen from the marina that is located about a mile north of the bridge. The photo below is one of the smaller side channel bridges on the Wisconsin side of the river crossing.