US 89 over Muddy Creek
GoodCascade County, Montana · Vaughn · Structure no. P00003000+04151
- Built
- 2002
- 23 years old
- Condition
- Good
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 166 ft
- 3 main spans
- Daily traffic
- 5,732
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 89 over Muddy Creek is a prestressed concrete stringer/multi-beam or girder carrying US 89 over Muddy Creek in Cascade County, Montana. It was built in 2002, so it is 23 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 5,732 vehicles a day, roughly 3% of them trucks, projected to reach 6,019 by 2043. The structure is 166 ft (50.6 m) long and 65 ft wide. If it were closed, the detour would be 42.9 mi (69 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 US 89 over Muddy Creek built?
It was built in 2002, making it 23 years old in 2025.
What condition is US 89 over Muddy 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 March 2024.
How much traffic does US 89 over Muddy Creek carry?
About 5,732 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is US 89 over Muddy Creek?
The structure is 166 ft (50.6 m) long with a longest span of 55 ft (16.7 m) and a deck 65 ft wide.
Who owns US 89 over Muddy Creek?
It is owned by the State Highway Agency.