By 1860, the line would receive another 49 mile extension to Jessup, Iowa.
At the end of 1860, the D&P would be purchased by the Dubuque and Sioux City Railroad, which desired to build west to Sioux City.
In 1861, the route would be extended to Cedar Falls, where it would terminate.
The D&SC would continue building west in 1866.
Beginning in 1867, the Illinois Central leased the D&SC. The route would be able to provide a mainline into Iowa for the company.
Relatively uncommon in the modern world of railroading, the Illinois Central did not fully consume the D&SC until 1946. Despite this, virtually every project was Illinois Central funded until then.
Immediately after this, the IC went to work rebuilding numerous older truss bridges along the line. This route served as the western mainline for the Illinois Central, which had grown to be considerable in size.
In 1972, the IC merged with the Gulf, Mobile & Ohio Railroad to form the Illinois Central Gulf. The ICG dissolved back into the Illinois Central in 1988.
The entire western main line and associated branch lines of the IC were sold to a railroad known as the Chicago Central and Pacific Railroad in 1985.
Just 11 years later, the route would again be purchased by Illinois Central. By 1999, the Illinois Central was purchased by Canadian National.
In 2017, Canadian National operates the Cedar Falls-Fort Dodge segment of this line as the Waterloo Subdivision.
06/26/21
Located in Dubuque, this is the only crossing of Catfish Creek along this route. Despite this, there are over 20 crossings of the branches of Catfish Creek.
Originally built in 1900, the bridge was rebuilt in 1921. The eastern span of the bridge was original to 1900 and retained in the 1921 reconstruction. The two western spans were added at this time, likely to replace a truss. The bridge sits on concrete substructures.
Spans like this are common for crossing large creeks, as they make exceptionally good multiple span structures. There is a visible difference between the eastern span and the western two spans.
Currently, the bridge is owned by Canadian National. It is located underneath Rockdale Road.
Overall, the bridge appears to be in good condition, with no visible major deterioration.
The author has ranked this bridge as being locally significant, due to common design.
The photo above is an overview.