Csah 21 over Birch River
GoodSt. Louis County, Minnesota · 1.1 MI N of JCT CSAH70 · Structure no. 69A53
- Built
- 2016
- 9 years old
- Condition
- Good
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 81 ft
- 1 main span
- Daily traffic
- 1,500
- 2019 count
- Owner
- County
- County Highway Agency
About this bridge
Csah 21 over Birch River is a prestressed concrete stringer/multi-beam or girder carrying Csah 21 over Birch River in St. Louis County, Minnesota. It was built in 2016, so it is 9 years old, younger than the Minnesota average of 38.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 1,500 vehicles a day, projected to reach 1,550 by 2039. The structure is 81 ft (24.7 m) long and 43 ft wide. If it were closed, the detour would be 6.8 mi (11 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Csah 21 over Birch River built?
It was built in 2016, making it 9 years old in 2025.
What condition is Csah 21 over Birch River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.
How much traffic does Csah 21 over Birch River carry?
About 1,500 vehicles per day (2019 count).
How long is Csah 21 over Birch River?
The structure is 81 ft (24.7 m) long with a longest span of 78 ft (23.7 m) and a deck 43 ft wide.
Who owns Csah 21 over Birch River?
It is owned by the County Highway Agency.