St. Louis, Iron Mountain & Southern Railroad

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Allenville Railroad Bridge (Cape Girardeau County, Missouri)
Built 1918 by the Bethlehem Steel Bridge Corp.
Through truss railroad bridge over the Diversion Channel between Allenville and Delta on the Belmont Branch, Iron Mountain Railroad
No longer in use

Arkansas River Railroad Bridge (Sebastian County, Arkansas)
Built 1891, removed 1969
Lost Through truss bridge over Arkansas River for Railroad and at one time Wagon traffic in Ft. Smith. It was removed due to the Kerr-McClellan Arkansas river navigation project.
Lost

Collier Creek Railroad Bridge (Montgomery County, Arkansas)
Built 1907
Lost Bridge over Collier Creek on Missouri Pacific RR
Lost

Fredericktown City Lake Railroad Bridge (Madison County, Missouri)
Abandoned deck girder railroad bridge over Fredericktown City Lake, a reservoir on Little St. Francis River
Abandoned with rails removed but otherwise in decent condition

Glenallen Tunnel (Bollinger County, Missouri)
Completed August 14, 1869; Final train through in April 1973; Abandoned 1974
Abandoned railroad tunnel north of Glenallen on the Belmont Branch, Iron Mountain Railroad; Later Missouri Pacific
Abandoned and inaccessible on private land

Hendrickson Viaduct (Butler County, Missouri)
Built 1933
Concrete bridge with balusters on Old US 67 over the Union Pacific Railroad west of Hendrickson
Open to traffic, providing access to the Hendrickson boat ramp

Irondale Bridge (Washington County, Missouri)
Built 1856
Stone arch bridge over Dry Creek on the Iron Mountain Railroad (now Union Pacific Railroad) in Irondale
Open to railroad traffic

Irondale Railroad Bridge (Washington County, Missouri)
Deck truss bridge over Big River on the Iron Mountain Railroad (now UPRR) north of Irondale
Open to railroad traffic

Mengo Bridge (Butler County, Missouri)
Built 1906 by the American Bridge Co.
Two-span through truss bridge over Black River on the Union Pacific Railroad, between Poplar Bluff and Hilliard
Still in use