SH 55 over Boise River;n.Channel
GoodAda County, Idaho · 0.7 S. Eagle · Structure no. 000000000015180
- Built
- 1978
- 47 years old, rebuilt 1998
- Condition
- Good
- inspected January 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 243 ft
- 3 main spans
- Daily traffic
- 41,500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 55 over Boise River;n.Channel is a prestressed concrete stringer/multi-beam or girder carrying SH 55 over Boise River;n.Channel in Ada County, Idaho. It was built in 1978 and reconstructed in 1998, so it is 47 years old, older 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 41,500 vehicles a day, roughly 5% of them trucks, projected to reach 62,250 by 2042. The structure is 243 ft (74.1 m) long and 86 ft wide. If it were closed, the detour would be 11.2 mi (18 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 | 7 Good | Some minor problems. |
| 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 SH 55 over Boise River;n.Channel built?
It was built in 1978, making it 47 years old in 2025. It was reconstructed in 1998.
What condition is SH 55 over Boise River;n.Channel 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 January 2024.
How much traffic does SH 55 over Boise River;n.Channel carry?
About 41,500 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is SH 55 over Boise River;n.Channel?
The structure is 243 ft (74.1 m) long with a longest span of 89 ft (27 m) and a deck 86 ft wide.
Who owns SH 55 over Boise River;n.Channel?
It is owned by the State Highway Agency.