IRR - US 93 over Nine Pipe Reservoir
PoorLake County, Montana · 5M S Ronan · Structure no. P00005040+09851
- Built
- 1933
- 92 years old, rebuilt 1950
- Condition
- Poor
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 77 ft
- 4 main spans
- Daily traffic
- 8,158
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - US 93 over Nine Pipe Reservoir is a wood or timber stringer/multi-beam or girder carrying IRR - US 93 over Nine Pipe Reservoir in Lake County, Montana. It was built in 1933 and reconstructed in 1950, so it is 92 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 8,158 vehicles a day, roughly 5% of them trucks, projected to reach 8,566 by 2043. The structure is 77 ft (23.6 m) long and 30 ft wide. If it were closed, the detour would be 36 mi (58 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - US 93 over Nine Pipe Reservoir built?
It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1950.
What condition is IRR - US 93 over Nine Pipe Reservoir in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2025.
How much traffic does IRR - US 93 over Nine Pipe Reservoir carry?
About 8,158 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is IRR - US 93 over Nine Pipe Reservoir?
The structure is 77 ft (23.6 m) long with a longest span of 19 ft (5.8 m) and a deck 30 ft wide.
Who owns IRR - US 93 over Nine Pipe Reservoir?
It is owned by the State Highway Agency.