| State Street Bridge | |
| Coordinates: | 43.1518°N -93.1917°W |
| Built: | 1903 |
| Added: | June 25, 1998 |
| Area: | less than one acre |
| Refnum: | 98000740 |
The State Street Bridge is a historic structure located in Mason City, Iowa, United States. The span carries East State Street over Willow Creek for 62feet. In the mid- to late-19th century, State Street was the only road into town from the east. There was a bridge at this crossing from at least 1875, but it is unknown what kind of bridges or how many served the crossing.[1] This bridge was completed in 1903 and features a barrel arch with filled spandrels. Although the original guardrails have been replaced, it is the oldest roadway arch bridge in Cerro Gordo County.[1] It was listed on the National Register of Historic Places in 1998.