Millegan RD over Smith River
GoodCascade County, Montana · 15M SE Ulm · Structure no. S00330015+02001
- Built
- 1962
- 63 years old
- Condition
- Good
- inspected March 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 144 ft
- 2 main spans
- Daily traffic
- 294
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Millegan RD over Smith River is a prestressed concrete stringer/multi-beam or girder carrying Millegan RD over Smith River in Cascade County, Montana. It was built in 1962, so it is 63 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 294 vehicles a day, roughly 3% of them trucks, projected to reach 309 by 2043. The structure is 144 ft (43.9 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 8 Very Good | No problems noted. |
| 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 Millegan RD over Smith River built?
It was built in 1962, making it 63 years old in 2025.
What condition is Millegan RD over Smith 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 March 2023.
How much traffic does Millegan RD over Smith River carry?
About 294 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Millegan RD over Smith River?
The structure is 144 ft (43.9 m) long with a longest span of 71 ft (21.6 m) and a deck 31 ft wide.
Who owns Millegan RD over Smith River?
It is owned by the State Highway Agency.