Birch ST over State Route 73
FairOrange County, California · 12-ORA-073-R25.46-NPTB · Structure no. 55 0636
- Built
- 1985
- 40 years old, rebuilt 1998
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 266 ft
- 2 main spans
- Daily traffic
- 10,000
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
Birch ST over State Route 73 is a prestressed concrete continuous box beam or girders - multiple carrying Birch ST over State Route 73 in Orange County, California. It was built in 1985 and reconstructed in 1998, so it is 40 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 10,000 vehicles a day, roughly 1% of them trucks, projected to reach 11,000 by 2042. The structure is 266 ft (81.2 m) long and 108 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Birch ST over State Route 73 built?
It was built in 1985, making it 40 years old in 2025. It was reconstructed in 1998.
What condition is Birch ST over State Route 73 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 May 2024.
How much traffic does Birch ST over State Route 73 carry?
About 10,000 vehicles per day (2014 count), of which roughly 1% are trucks.
How long is Birch ST over State Route 73?
The structure is 266 ft (81.2 m) long with a longest span of 133 ft (40.5 m) and a deck 108 ft wide.
Who owns Birch ST over State Route 73?
It is owned by the State Highway Agency.