Nhs 7553;CAPITOL over Boise River
FairAda County, Idaho · In Boise;capitol Blvd · Structure no. 000000000021445
- Built
- 1931
- 94 years old, rebuilt 1992
- Condition
- Fair
- inspected September 2024
- Type
- Arch - Deck
- Concrete
- Length
- 303 ft
- 4 main spans
- Daily traffic
- 16,500
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Nhs 7553;CAPITOL over Boise River is a concrete arch - deck carrying Nhs 7553;CAPITOL over Boise River in Ada County, Idaho. It was built in 1931 and reconstructed in 1992, so it is 94 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 16,500 vehicles a day, roughly 2% of them trucks, projected to reach 24,750 by 2042. The structure is 303 ft (92.4 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Nhs 7553;CAPITOL over Boise River built?
It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1992.
What condition is Nhs 7553;CAPITOL over Boise River 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 September 2024.
How much traffic does Nhs 7553;CAPITOL over Boise River carry?
About 16,500 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is Nhs 7553;CAPITOL over Boise River?
The structure is 303 ft (92.4 m) long with a longest span of 76 ft (23.2 m) and a deck 63 ft wide.
Who owns Nhs 7553;CAPITOL over Boise River?
It is owned by the County Highway Agency.