Interstate 40 over Blair Ditch
GoodSan Bernardino County, California · 08-SBD-040-0.46-BSW · Structure no. 54 0784
- Built
- 1961
- 64 years old
- Condition
- Good
- inspected September 2024
- Type
- Culvert
- Concrete
- Length
- 26 ft
- 3 main spans
- Daily traffic
- 38,500
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 40 over Blair Ditch is a concrete culvert carrying Interstate 40 over Blair Ditch in San Bernardino County, California. It was built in 1961, so it is 64 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 38,500 vehicles a day, roughly 35% of them trucks, projected to reach 46,521 by 2046. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 0.6 mi (1 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 40 over Blair Ditch built?
It was built in 1961, making it 64 years old in 2025.
What condition is Interstate 40 over Blair Ditch 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 September 2024.
How much traffic does Interstate 40 over Blair Ditch carry?
About 38,500 vehicles per day (2024 count), of which roughly 35% are trucks.
How long is Interstate 40 over Blair Ditch?
The structure is 26 ft (7.9 m) long with a longest span of 8 ft (2.4 m).
Who owns Interstate 40 over Blair Ditch?
It is owned by the State Highway Agency.