Cottonwood Creek Bridge (Ismay, Montana)

The Cottonwood Creek Bridge is a bridge in Fallon County, Montana near the town of Ismay, built in 1934. It was listed on the National Register of Historic Places in 2014. From 1926 to 1941, at least 1,242 timber stringer bridges were built in Montana; this is one of very few intact surviving bridges.

It was listed as part of a statewide study of timber stringer bridges.

It was built by Emil Prahl and Henry Sawtell, both of Miles City, to the standardized plans provided by the Montana Highway Department, a predecessor agency to the Montana Department of Transportation. It is a five-span continuous treated timber stringer bridge which is 95 ft long and 20 ft wide with a roadway width of 19 ft. Its ends are supported by timber abutments and wingwalls braced with wood pilings. The spans are between four sets of treated timber pile bents made of Douglas fir.