SH 55 over Wilson Drain
FairCanyon County, Idaho · 2 W. Nampa · Structure no. 000000000014715
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected February 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 48 ft
- 1 main span
- Daily traffic
- 25,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 55 over Wilson Drain is a prestressed concrete stringer/multi-beam or girder carrying SH 55 over Wilson Drain in Canyon County, Idaho. It was built in 1973, so it is 52 years old, older than the Idaho average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 25,000 vehicles a day, roughly 5% of them trucks, projected to reach 37,500 by 2042. The structure is 48 ft (14.6 m) long and 52 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 55 over Wilson Drain built?
It was built in 1973, making it 52 years old in 2025.
What condition is SH 55 over Wilson Drain in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2023.
How much traffic does SH 55 over Wilson Drain carry?
About 25,000 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is SH 55 over Wilson Drain?
The structure is 48 ft (14.6 m) long with a longest span of 46 ft (14 m) and a deck 52 ft wide.
Who owns SH 55 over Wilson Drain?
It is owned by the State Highway Agency.