- 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
06/26/21
Located pm the east side of Sparta, this small through girder bridge crosses Harmony Avenue.
Built in 1911, the bridge is listed as a through girder, although also gives the resemblance of a steel stringer. The bridge rests on concrete substructures.
Throughout the Sparta-Milwaukee line, there are a number of other similar bridges. This span currently serves an unnamed trail.
Overall, the bridge appears to be in fair condition, with some deterioration on the substructures.
The author has ranked the bridge as being locally significant, due to the common design.
The photo above is an overview.