Black LN over Surprise Ditch 056
GoodRavalli County, Montana · 2M N Hamilton · Structure no. L41318001+04001
- Built
- 2013
- 12 years old
- Condition
- Good
- inspected August 2023
- Type
- Slab
- Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 1,206
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Black LN over Surprise Ditch 056 is a concrete slab carrying Black LN over Surprise Ditch 056 in Ravalli County, Montana. It was built in 2013, so it is 12 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 1,206 vehicles a day, roughly 2% of them trucks, projected to reach 1,290 by 2043. The structure is 30 ft (9.1 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Black LN over Surprise Ditch 056 built?
It was built in 2013, making it 12 years old in 2025.
What condition is Black LN over Surprise Ditch 056 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 August 2023.
How much traffic does Black LN over Surprise Ditch 056 carry?
About 1,206 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is Black LN over Surprise Ditch 056?
The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.4 m) and a deck 38 ft wide.
Who owns Black LN over Surprise Ditch 056?
It is owned by the County Highway Agency.