Interstate 15 SB over Flat Ditch
GoodSan Bernardino County, California · 08-SBD-015-R101.48 · Structure no. 54 0639L
- Built
- 1963
- 62 years old
- Condition
- Good
- inspected September 2023
- Type
- Slab
- Concrete Continuous
- Length
- 98 ft
- 4 main spans
- Daily traffic
- 28,000
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 15 SB over Flat Ditch is a concrete continuous slab carrying Interstate 15 SB over Flat Ditch in San Bernardino County, California. It was built in 1963, so it is 62 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 28,000 vehicles a day, roughly 20% of them trucks, projected to reach 36,400 by 2043. The structure is 98 ft (30 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 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 Interstate 15 SB over Flat Ditch built?
It was built in 1963, making it 62 years old in 2025.
What condition is Interstate 15 SB over Flat 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 2023.
How much traffic does Interstate 15 SB over Flat Ditch carry?
About 28,000 vehicles per day (2021 count), of which roughly 20% are trucks.
How long is Interstate 15 SB over Flat Ditch?
The structure is 98 ft (30 m) long with a longest span of 25 ft (7.7 m) and a deck 42 ft wide.
Who owns Interstate 15 SB over Flat Ditch?
It is owned by the State Highway Agency.