| Name | IAIS 272nd Street Bridge Chicago, Rock Island & Pacific Railroad Bridge #4751 |
| Built By | Chicago Great Western Railway |
| Currently Owned By | Iowa Interstate Railroad |
| Superstructure Contractor | Unknown |
| Substructure Contractor | Duvall & McKinney of Logan, Iowa |
| Length | 42 Feet Total |
| Width | 1 Track |
| Height Above Ground | 14 Feet 2 Inches |
| Superstructure Design | Steel Stringer |
| Substructure Design | Concrete |
| Date Built | 1938 |
| Traffic Count | 3 Trains/Day (Estimated) |
| Current Status | In Use |
| Chicago, Rock Island & Pacific Railroad Bridge Number | 4751 |
| Iowa Interstate Railroad Bridge Number | 475.10 |
| Significance | Local Significance |
| Documentation Date | 10/20/2018 |
In 1886, the Mason City & Fort Dodge Railroad (MC&FD) constructed 73 miles of new railroad, extending from Mason City, Iowa to Fort Dodge, Iowa. In 1901, the MC&FD was leased by the Chicago Great Western Railway (CGW). Between 1902 and 1903, the MC&FD constructed 133 miles of new railroad, extending from Fort Dodge, Iowa to Council Bluffs, Iowa. The CGW would be reorganized as the Chicago Great Western Railroad in 1909, and maintained a lease of the MC&FD property. The CGW had acquired and constructed a modest railroad network throughout Illinois, Iowa, Minnesota and Missouri; connecting major cities in these states. The CGW was one of the smaller railroads in the area, and was late to develop lines. As a result, the railroad never saw the fortunes of other railroads in the area. This line served as a principal mainline for the CGW, serving agricultural industries and providing a connection to terminals at Omaha, Nebraska. In the early 20th Century, the CGW was often surviving on razor-thin profit margins. In 1940, the CGW entered bankruptcy, and was again reorganized as the Chicago Great Western Railway. At this time, the MC&FD was formally merged into the CGW. After the bankruptcy, the CGW became an innovative railroad, pioneering intermodal service and becoming one of the first railroads to completely switch to diesel locomotives. A capital improvement program was launched in 1949, which sought to rebuild and rehabilitate deteriorated infrastructure.
In 1953, the Chicago, Rock Island & Pacific Railroad (Rock Island) began using a segment between McClelland, Iowa and Council Bluffs. In 1968, the CGW was purchased by the Chicago & North Western Railway (C&NW). The C&NW already owned a better constructed route serving Council Bluffs, and much of this line became excess for the C&NW. In 1971, a section of the line between Harlan and Council Bluffs was abandoned, and the McClelland to Council Bluffs segment sold to the Rock Island. An additional segment between Somers and Carroll was abandoned in 1977, followed by a section between Manning and Harlan in 1981 and a section between Carroll and Manning in 1983. After the Rock Island went bankrupt in 1980, the McClelland to Council Bluffs segment became part of the Iowa Interstate Railroad (IAIS). In 1995, the C&NW was purchased by Union Pacific Railroad (UP). UP abandoned a section of the line between Thornton and Belmond in 2000, followed by a section between Mason City and Thornton in 2007 and a section between Roelyn and Somers in 2008. Today, UP operates the Fort Dodge Subdivision between Belmond and Roelyn and IAIS operates a short segment of the Council Bluffs Subdivision between McClelland and Council Blufffs. The segment between Mason City and Belmond was acquired for trail use, and portions of the right-of-way have been reused as part of the Prairie Land Trail. The remainder of the line has largely reverted to adjacent landowners, and has been converted to farm fields.
Located east of the small town of McClelland, this steel stringer bridge carries a former Chicago Great Western Railway (and later Chicago, Rock Island & Pacific Railroad) mainline over 272nd Street. Prior to the construction of this bridge, a grade crossing existed at this location. Between the 1920s and 1940s, the Iowa State Highway Commission (ISHC) worked with railroads throughout Iowa to construct grade separations at busy grade crossings. Evidently, 272nd Street was a busy enough crossing to warrant an underpass, and the project was bid in October 1937. Work on the underpass was completed throughout the 1938 construction season. Currently, the bridge consists of a 42-foot skewed steel stringer span, set onto concrete substructures. The superstructure uses a standard design, with four shallow beams, a fascia girder on either face and a ballast deck. The abutments use a decorative design, with imprints and spires at each corner. An unknown contractor fabricated the superstructure, while Duvall & McKinney constructed the substructure, erected the span and completed the roadway improvements. Steel stringer spans were popular for railroad use, as they were durable and easy to construct. Most underpasses in Iowa had minimal decorative features, and it is very unusual to see an underpass over a gravel road in a rural area using decorative features. Since the initial construction, the bridge has seen no significant alterations. Today, the bridge remains in regular use. Overall, the bridge appears to be in fair to good condition, with no significant deterioration noted. The author has ranked this bridge as being locally significant, due to the common design.
Citations
| Build date and builder (substructure) | The Ames Tribune; October 29, 1937 |
| Railroad History Citation | ICC Valuation Information, Compiled by Richard S. Steele |