Byron HWY over California Aqueduct
PoorContra Costa County, California · 5.6 MI South of SR 4 · Structure no. 28C0121
- Built
- 1964
- 61 years old
- Condition
- Poor
- inspected August 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 343 ft
- 5 main spans
- Daily traffic
- 8,387
- 2008 count
- Owner
- State
- Other State Agency
About this bridge
Byron HWY over California Aqueduct is a concrete continuous tee beam carrying Byron HWY over California Aqueduct in Contra Costa County, California. It was built in 1964, so it is 61 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.
It carries about 8,387 vehicles a day, roughly 12% of them trucks, projected to reach 12,572 by 2046. The structure is 343 ft (104.5 m) long and 34 ft wide. If it were closed, the detour would be 36 mi (58 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Byron HWY over California Aqueduct built?
It was built in 1964, making it 61 years old in 2025.
What condition is Byron HWY over California Aqueduct in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.
How much traffic does Byron HWY over California Aqueduct carry?
About 8,387 vehicles per day (2008 count), of which roughly 12% are trucks.
How long is Byron HWY over California Aqueduct?
The structure is 343 ft (104.5 m) long with a longest span of 75 ft (22.9 m) and a deck 34 ft wide.
Who owns Byron HWY over California Aqueduct?
It is owned by the Other State Agency.