SH 55 over Uprr;n.Fk.Payette River
PoorValley County, Idaho · 3.0 N. Smiths Ferry · Structure no. 000000000014805
- Built
- 1933
- 92 years old, rebuilt 2007
- Condition
- Poor
- inspected May 2024
- Type
- Arch - Deck
- Concrete
- Length
- 411 ft
- 8 main spans
- Daily traffic
- 4,100
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 55 over Uprr;n.Fk.Payette River is a concrete arch - deck carrying SH 55 over Uprr;n.Fk.Payette River in Valley County, Idaho. It was built in 1933 and reconstructed in 2007, so it is 92 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.
It carries about 4,100 vehicles a day, roughly 17% of them trucks, projected to reach 6,150 by 2042. The structure is 411 ft (125.3 m) long and 28 ft wide. If it were closed, the detour would be 47.8 mi (77 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| 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 SH 55 over Uprr;n.Fk.Payette River built?
It was built in 1933, making it 92 years old in 2025. It was reconstructed in 2007.
What condition is SH 55 over Uprr;n.Fk.Payette 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 May 2024.
How much traffic does SH 55 over Uprr;n.Fk.Payette River carry?
About 4,100 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is SH 55 over Uprr;n.Fk.Payette River?
The structure is 411 ft (125.3 m) long with a longest span of 189 ft (57.6 m) and a deck 28 ft wide.
Who owns SH 55 over Uprr;n.Fk.Payette River?
It is owned by the State Highway Agency.