I 90 over Lower Deer Creek
GoodSweet Grass County, Montana · 0.6M W Greycliff · Structure no. I00090377+02362
- Built
- 1980
- 45 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 72 ft
- 1 main span
- Daily traffic
- 6,153
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Lower Deer Creek is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Lower Deer Creek in Sweet Grass County, Montana. It was built in 1980, so it is 45 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 6,153 vehicles a day, roughly 17% of them trucks, projected to reach 6,614 by 2043. The structure is 72 ft (21.8 m) long and 44 ft wide.
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 I 90 over Lower Deer Creek built?
It was built in 1980, making it 45 years old in 2025.
What condition is I 90 over Lower Deer Creek 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 2023.
How much traffic does I 90 over Lower Deer Creek carry?
About 6,153 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is I 90 over Lower Deer Creek?
The structure is 72 ft (21.8 m) long with a longest span of 66 ft (20.1 m) and a deck 44 ft wide.
Who owns I 90 over Lower Deer Creek?
It is owned by the State Highway Agency.