Quick Facts
- Number of bridges in Minnesota: 19,000 with spans of 10' or greater.
- How old does a bridge need to be to be "historic"? 50 years.
- Are all bridges more than 50 years old historic? No, about 200 bridges in Minnesota are considered historic.
- What makes a bridge historic? Bridges can be historic for several reasons, including significant engineering accomplishments, aesthetic details or association with important transportation projects. Learn more
Documents
Historic Bridges
Bridge 5151, built in 1931, crosses over the Redwood River in Lyon County. The bridge is a rare surviving example of a State Highway Department ornamental urban bridge design.
Preserving key historic bridges is important to Minnesota’s engineering heritage and generates tourism and economic benefits for local communities.
Just imagine:
- The Minneapolis river front without the graceful arches of the Stone Arch or 3rd Avenue bridges
- East Grand Forks without the impressive truss of the Sorlie Bridge
- Hwy 169 along Lake Mille Lacs without the craftsmanship of the Whitefish Creek and Garrison bridges
Read more about historic bridges.
Mystery Bridges
How Can I Save a Bridge in my Community?
Start by reading the General Bridge Management Plan (PDF) for an overview of issues related to historic bridge preservation, including regulations, funding, and rehabilitation considerations. If you think your bridge might qualify for preservation, contact Mn/DOT. Staff in our Cultural Resources Unit and Bridge Office will provide guidance throughout the preservation process.