56th ST W over Big Ditch 071
FairYellowstone County, Montana · 3M W Billings · Structure no. L56506000+05001
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected December 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 24 ft
- 1 main span
- Daily traffic
- 2,799
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
56th ST W over Big Ditch 071 is a prestressed concrete tee beam carrying 56th ST W over Big Ditch 071 in Yellowstone County, Montana. It was built in 1964, so it is 61 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 2,799 vehicles a day, roughly 3% of them trucks, projected to reach 2,953 by 2043. The structure is 24 ft (7.3 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 56th ST W over Big Ditch 071 built?
It was built in 1964, making it 61 years old in 2025.
What condition is 56th ST W over Big Ditch 071 in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.
How much traffic does 56th ST W over Big Ditch 071 carry?
About 2,799 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is 56th ST W over Big Ditch 071?
The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 26 ft wide.
Who owns 56th ST W over Big Ditch 071?
It is owned by the County Highway Agency.