Interstate 15 over Ontario Mills Parkway
FairSan Bernardino County, California · 08-SBD-015-2.56-ONT · Structure no. 54 0911
- Built
- 1975
- 50 years old, rebuilt 2011
- Condition
- Fair
- inspected February 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 123 ft
- 1 main span
- Daily traffic
- 211,000
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 15 over Ontario Mills Parkway is a prestressed concrete box beam or girders - multiple carrying Interstate 15 over Ontario Mills Parkway in San Bernardino County, California. It was built in 1975 and reconstructed in 2011, so it is 50 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 211,000 vehicles a day, roughly 10% of them trucks, projected to reach 220,015 by 2042. The structure is 123 ft (37.5 m) long and 230 ft wide. If it were closed, the detour would be 1.2 mi (2 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 Interstate 15 over Ontario Mills Parkway built?
It was built in 1975, making it 50 years old in 2025. It was reconstructed in 2011.
What condition is Interstate 15 over Ontario Mills Parkway 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 2024.
How much traffic does Interstate 15 over Ontario Mills Parkway carry?
About 211,000 vehicles per day (2022 count), of which roughly 10% are trucks.
How long is Interstate 15 over Ontario Mills Parkway?
The structure is 123 ft (37.5 m) long with a longest span of 123 ft (37.5 m) and a deck 230 ft wide.
Who owns Interstate 15 over Ontario Mills Parkway?
It is owned by the State Highway Agency.