- 1884: 16 miles completed between Wyeville and Necedah, Wisconsin by the Princeton and Western Railway
- 1911: 125 miles completed from Necedah to Butler, Wisconsin by the Milwaukee, Sparta & North Western Railway
- Double track constructed between Butler and Clyman Junction
- Connection to Chicago, St. Paul, Minneapolis & Omaha Railway mainline at Wyeville, providing faster connection to the Twin Cities
- 1912: 23 miles completed from Wyeville to Sparta, Wisconsin by the Milwaukee, Sparta & North Western Railway
- 1912: Princeton and Western acquired by the Milwaukee, Sparta & North Western Railway
- 1912: MS&NW acquired by the Chicago & North Western Railway
- 1959: Second track removed from Butler to Clyman
- 1972: Tunnel collapse at Tunnel City, Wisconsin
- 1977: Line abandoned between Tunnel City and Sparta due to tunnel collapse
- 1995: Chicago & North Western purchased by Union Pacific Railroad
- 1995-Present: Union Pacific operates the Adams Subdivision from Butler to Adams
- 1995-Present: Union Pacific operates the Wyeville Subdivision from Adams to Wyeville
- 1995-Present: Union Pacific operates the Winona Subdivision from Wyeville to Tunnel City
02/25/23
This massive through girder bridge crosses the Rock River at a station known as Rock, near Ashippun.
The bridge is located off Red Wing Road, a public road according to Dodge County GIS services. However, local property owners are less than thrilled to see travelers come down this road.
Made of three spans, this through plate girder bridge rests on concrete substructures. It was built in 1911 during a line rebuilt.
Missing plates indicate that American Bridge Company built this structure. American Bridge Company was one of several contractors that helped build this line.
The author has ranked this bridge as locally significant, due to the size of the bridge. It is one of the larger bridges on this line.
The photo below is an overview.
| Upstream | Horicon Rail Bridge |
| Overflow | UP Rock River Overflow Bridge |
| Downstream | Ixonia Rail Bridge |