I 15 over Dry Fork Marias River
GoodPondera County, Montana · 2M N Conrad · Structure no. I00015342+00251
- Built
- 1972
- 53 years old
- Condition
- Good
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 247 ft
- 4 main spans
- Daily traffic
- 1,727
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Dry Fork Marias River is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Dry Fork Marias River in Pondera County, Montana. It was built in 1972, so it is 53 years old, older 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 1,727 vehicles a day, roughly 24% of them trucks, projected to reach 1,813 by 2043. The structure is 247 ft (75.3 m) long and 44 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 | 8 Very Good | No problems noted. |
| 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 I 15 over Dry Fork Marias River built?
It was built in 1972, making it 53 years old in 2025.
What condition is I 15 over Dry Fork Marias 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 December 2024.
How much traffic does I 15 over Dry Fork Marias River carry?
About 1,727 vehicles per day (2023 count), of which roughly 24% are trucks.
How long is I 15 over Dry Fork Marias River?
The structure is 247 ft (75.3 m) long with a longest span of 72 ft (21.8 m) and a deck 44 ft wide.
Who owns I 15 over Dry Fork Marias River?
It is owned by the State Highway Agency.