State Route 18 over Bonnie Canyon
GoodSan Bernardino County, California · 08-SBD-018-R16.54 · Structure no. 54 0876
- Built
- 1970
- 55 years old
- Condition
- Good
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 232 ft
- 3 main spans
- Daily traffic
- 16,800
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 18 over Bonnie Canyon is a steel continuous stringer/multi-beam or girder carrying State Route 18 over Bonnie Canyon in San Bernardino County, California. It was built in 1970, so it is 55 years old, older than the California average of 54.8 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 16,800 vehicles a day, roughly 10% of them trucks, projected to reach 20,000 by 2043. The structure is 232 ft (70.6 m) long and 63 ft wide. If it were closed, the detour would be 47.2 mi (76 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 18 over Bonnie Canyon built?
It was built in 1970, making it 55 years old in 2025.
What condition is State Route 18 over Bonnie Canyon 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 State Route 18 over Bonnie Canyon carry?
About 16,800 vehicles per day (2017 count), of which roughly 10% are trucks.
How long is State Route 18 over Bonnie Canyon?
The structure is 232 ft (70.6 m) long with a longest span of 108 ft (32.8 m) and a deck 63 ft wide.
Who owns State Route 18 over Bonnie Canyon?
It is owned by the State Highway Agency.