Diamond Match RD over RR
FairMineral County, Montana · 3M SE Superior · Structure no. S00257003+02161
- Built
- 1955
- 70 years old
- Condition
- Fair
- inspected May 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 188 ft
- 5 main spans
- Daily traffic
- 743
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Diamond Match RD over RR is a concrete continuous tee beam carrying Diamond Match RD over RR in Mineral County, Montana. It was built in 1955, so it is 70 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 743 vehicles a day, roughly 8% of them trucks, projected to reach 780 by 2043. The structure is 188 ft (57.3 m) long and 27 ft wide. If it were closed, the detour would be 14.9 mi (24 km).
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Diamond Match RD over RR built?
It was built in 1955, making it 70 years old in 2025.
What condition is Diamond Match RD over RR 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 May 2023.
How much traffic does Diamond Match RD over RR carry?
About 743 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is Diamond Match RD over RR?
The structure is 188 ft (57.3 m) long with a longest span of 57 ft (17.4 m) and a deck 27 ft wide.
Who owns Diamond Match RD over RR?
It is owned by the State Highway Agency.