- 1865: 22 miles completed from Mendota to Merriam Junction, Minnesota by the Minnesota Valley Railway Company
- 1866: 17 miles completed from Merriam Junction to Belle Plaine, Minnesota by the Minnesota Valley Railway Company
- 1867: 16 miles completed from Belle Plaine to Le Sueur, Minnesota by the Minnesota Valley Railway Company
- 1868: 12 miles completed from Le Sueur to Kasota, Minnesota by the Minnesota Valley Railway Company
- 1869: 5 miles completed from Mendota to St. Paul, Minnesota by the Minnesota Valley Railway Company
- 1869: 22 miles completed from Kasota to Lake Crystal, Minnesota by the Minnesota Valley Railway Company
- 1869: 22 miles completed from Lake Crystal to St. James, Minnesota by the St. Paul and Sioux City Railroad
- 1869: 22 miles completed from Lake Crystal to St. James, Minnesota by the St. Paul and Sioux City Railroad
- 1870: Minnesota Valley Railway purchased by the St. Paul and Sioux City Railroad
- 1871: 58 miles completed from St. James to Worthington, Minnesota by the St. Paul and Sioux City Railroad
- 1872: 64 miles completed from Worthington to Le Mars, Iowa by the St. Paul and Sioux City Railroad
- 1881: StP&SC sold to the Chicago, St. Paul, Minneapolis & Omaha Railway
- 1882: CStPM&O leased by the Chicago & North Western Railway
- 1882: CStPM&O acquired by the Chicago & North Western Railway
- 1995: C&NW purchased by Union Pacific Railroad
- 1995-Present: Union Pacific operates the St. Paul to St. James segment as the Mankato Subdivision
- 1995-Present: Union Pacific operates the St. James to Sioux City segment as the Worthington Subdivision
02/25/23
Located just north of Alton, this steel stringer bridge crosses a small drainage ditch alongside Iowa Highway 60.
Built in 1910, the bridge consists of a single steel stringer span, set onto concrete substructures. The beams on this bridge are arranged in two sets of four, for eight total beams. Two other identical spans exist between Hospers and Alton.
It appears that the bridge is relatively unchanged since the original construction.
Overall, the bridge appears to be in good condition, with little notable deterioration, with the exception of some minor spalling.
The author has ranked the bridge as being minimally significant, due to the common design.
The photo above is an overview.