N. St. Charles over Lemhi River
PoorLemhi County, Idaho · 0.4 N. 0.3 E. Salmon · Structure no. 000000000032755
- Built
- 1948
- 77 years old, rebuilt 1965
- Condition
- Poor
- inspected July 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 79 ft
- 2 main spans
- Daily traffic
- 310
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
N. St. Charles over Lemhi River is a prestressed concrete tee beam carrying N. St. Charles over Lemhi River in Lemhi County, Idaho. It was built in 1948 and reconstructed in 1965, so it is 77 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 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 310 vehicles a day, roughly 5% of them trucks, projected to reach 465 by 2039. The structure is 79 ft (24.1 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N. St. Charles over Lemhi River built?
It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1965.
What condition is N. St. Charles over Lemhi River 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 July 2024.
How much traffic does N. St. Charles over Lemhi River carry?
About 310 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is N. St. Charles over Lemhi River?
The structure is 79 ft (24.1 m) long with a longest span of 39 ft (11.9 m) and a deck 16 ft wide.
Who owns N. St. Charles over Lemhi River?
It is owned by the County Highway Agency.