I 15 over Sep Lump Gulch Road
FairJefferson County, Montana · 0.6M N Clancy · Structure no. I00015182+07382
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected March 2024
- Type
- Slab
- Concrete Continuous
- Length
- 78 ft
- 3 main spans
- Daily traffic
- 3,787
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Sep Lump Gulch Road is a concrete continuous slab carrying I 15 over Sep Lump Gulch Road in Jefferson County, Montana. It was built in 1969, so it is 56 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 6 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 3,787 vehicles a day, roughly 10% of them trucks, projected to reach 3,976 by 2043. The structure is 78 ft (23.8 m) long and 40 ft wide.
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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Sep Lump Gulch Road built?
It was built in 1969, making it 56 years old in 2025.
What condition is I 15 over Sep Lump Gulch Road 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 March 2024.
How much traffic does I 15 over Sep Lump Gulch Road carry?
About 3,787 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is I 15 over Sep Lump Gulch Road?
The structure is 78 ft (23.8 m) long with a longest span of 31 ft (9.3 m) and a deck 40 ft wide.
Who owns I 15 over Sep Lump Gulch Road?
It is owned by the State Highway Agency.