SH 21 over Elk Creek
GoodBoise County, Idaho · 2.0 S. Idaho City · Structure no. 000000000012881
- Built
- 2000
- 25 years old
- Condition
- Good
- inspected October 2024
- Type
- Frame
- Concrete
- Length
- 24 ft
- 1 main span
- Daily traffic
- 2,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 21 over Elk Creek is a concrete frame carrying SH 21 over Elk Creek in Boise County, Idaho. It was built in 2000, so it is 25 years old, younger 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 2,000 vehicles a day, roughly 18% of them trucks, projected to reach 3,000 by 2042. The structure is 24 ft (7.3 m) long and 89 ft wide. If it were closed, the detour would be 24.9 mi (40 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 21 over Elk Creek built?
It was built in 2000, making it 25 years old in 2025.
What condition is SH 21 over Elk Creek 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 October 2024.
How much traffic does SH 21 over Elk Creek carry?
About 2,000 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is SH 21 over Elk Creek?
The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 89 ft wide.
Who owns SH 21 over Elk Creek?
It is owned by the State Highway Agency.