Duncan Canyon Road over Interstate 15
FairSan Bernardino County, California · 08-SBD-015-11.03-FNA · Structure no. 54 0980
- Built
- 1976
- 49 years old, rebuilt 2016
- Condition
- Fair
- inspected February 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 389 ft
- 2 main spans
- Daily traffic
- 2,000
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
Duncan Canyon Road over Interstate 15 is a prestressed concrete continuous box beam or girders - multiple carrying Duncan Canyon Road over Interstate 15 in San Bernardino County, California. It was built in 1976 and reconstructed in 2016, so it is 49 years old, younger than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 2,000 vehicles a day, roughly 2% of them trucks, projected to reach 3,000 by 2040. The structure is 389 ft (118.5 m) long and 106 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Duncan Canyon Road over Interstate 15 built?
It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2016.
What condition is Duncan Canyon Road over Interstate 15 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 February 2023.
How much traffic does Duncan Canyon Road over Interstate 15 carry?
About 2,000 vehicles per day (2016 count), of which roughly 2% are trucks.
How long is Duncan Canyon Road over Interstate 15?
The structure is 389 ft (118.5 m) long with a longest span of 194 ft (59.2 m) and a deck 106 ft wide.
Who owns Duncan Canyon Road over Interstate 15?
It is owned by the State Highway Agency.