Dunn LN over Boulder River 028
GoodJefferson County, Montana · 20M SE Boulder · Structure no. L22313000+06001
- Built
- 2015
- 10 years old
- Condition
- Good
- inspected September 2024
- Type
- Tee Beam
- Concrete
- Length
- 86 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Dunn LN over Boulder River 028 is a concrete tee beam carrying Dunn LN over Boulder River 028 in Jefferson County, Montana. It was built in 2015, so it is 10 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 86 ft (26.1 m) long and 26 ft wide. If it were closed, the detour would be 11.2 mi (18 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Dunn LN over Boulder River 028 built?
It was built in 2015, making it 10 years old in 2025.
What condition is Dunn LN over Boulder River 028 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 September 2024.
How much traffic does Dunn LN over Boulder River 028 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Dunn LN over Boulder River 028?
The structure is 86 ft (26.1 m) long with a longest span of 83 ft (25.3 m) and a deck 26 ft wide.
Who owns Dunn LN over Boulder River 028?
It is owned by the County Highway Agency.