3700 North over Big Lost River
GoodCuster County, Idaho · 1.2 E. Darlington · Structure no. 000000000031726
- Built
- 2010
- 15 years old
- Condition
- Good
- inspected July 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 87 ft
- 1 main span
- Daily traffic
- 50
- 2023 count
- Owner
- Local
- Other Local Agency
About this bridge
3700 North over Big Lost River is a prestressed concrete tee beam carrying 3700 North over Big Lost River in Custer County, Idaho. It was built in 2010, so it is 15 years old, younger than the Idaho average of 45.3 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 75 by 2039. The structure is 87 ft (26.5 m) long and 23 ft wide. If it were closed, the detour would be 1.9 mi (3 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 3700 North over Big Lost River built?
It was built in 2010, making it 15 years old in 2025.
What condition is 3700 North over Big Lost 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 July 2024.
How much traffic does 3700 North over Big Lost River carry?
About 50 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is 3700 North over Big Lost River?
The structure is 87 ft (26.5 m) long with a longest span of 85 ft (25.9 m) and a deck 23 ft wide.
Who owns 3700 North over Big Lost River?
It is owned by the Other Local Agency.