Old Mil. RR Grade over Trout Creek
PoorPosted for loadShoshone County, Idaho · 0.9N 3.1W Calder · Structure no. 000000000037085
- Built
- 1912
- 113 years old, rebuilt 1991
- Condition
- Poor
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 89 ft
- 1 main span
- Daily traffic
- 15
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Old Mil. RR Grade over Trout Creek is a steel stringer/multi-beam or girder carrying Old Mil. RR Grade over Trout Creek in Shoshone County, Idaho. It was built in 1912 and reconstructed in 1991, so it is 113 years old, older than the Idaho average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 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. Its operating status is: posted for load restriction.
It carries about 15 vehicles a day, roughly 1% of them trucks, projected to reach 23 by 2039. The structure is 89 ft (27.1 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old Mil. RR Grade over Trout Creek built?
It was built in 1912, making it 113 years old in 2025. It was reconstructed in 1991.
What condition is Old Mil. RR Grade over Trout Creek 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 August 2024.
How much traffic does Old Mil. RR Grade over Trout Creek carry?
About 15 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is Old Mil. RR Grade over Trout Creek?
The structure is 89 ft (27.1 m) long with a longest span of 39 ft (11.9 m) and a deck 16 ft wide.
Who owns Old Mil. RR Grade over Trout Creek?
It is owned by the County Highway Agency.