State Route 91 over Knott Ave
GoodOrange County, California · 12-ORA-091-R1.85-BPK · Structure no. 55 0300
- Built
- 1969
- 56 years old, rebuilt 1998
- Condition
- Good
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 148 ft
- 1 main span
- Daily traffic
- 265,000
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 91 over Knott Ave is a prestressed concrete box beam or girders - multiple carrying State Route 91 over Knott Ave in Orange County, California. It was built in 1969 and reconstructed in 1998, so it is 56 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 265,000 vehicles a day, roughly 6% of them trucks, projected to reach 295,000 by 2042. The structure is 148 ft (45.1 m) long and 177 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 91 over Knott Ave built?
It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1998.
What condition is State Route 91 over Knott Ave 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 State Route 91 over Knott Ave carry?
About 265,000 vehicles per day (2016 count), of which roughly 6% are trucks.
How long is State Route 91 over Knott Ave?
The structure is 148 ft (45.1 m) long with a longest span of 146 ft (44.5 m) and a deck 177 ft wide.
Who owns State Route 91 over Knott Ave?
It is owned by the State Highway Agency.