Interstate 605 over Walnut Creek
GoodLos Angeles County, California · 07-LA-605-R19.85-BWP · Structure no. 53 1343
- Built
- 1957
- 68 years old, rebuilt 1995
- Condition
- Good
- inspected April 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 467 ft
- 7 main spans
- Daily traffic
- 220,000
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 605 over Walnut Creek is a concrete continuous tee beam carrying Interstate 605 over Walnut Creek in Los Angeles County, California. It was built in 1957 and reconstructed in 1995, so it is 68 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 220,000 vehicles a day, roughly 12% of them trucks, projected to reach 274,219 by 2045. The structure is 467 ft (142.2 m) long and 171 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 605 over Walnut Creek built?
It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1995.
What condition is Interstate 605 over Walnut Creek 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 April 2024.
How much traffic does Interstate 605 over Walnut Creek carry?
About 220,000 vehicles per day (2022 count), of which roughly 12% are trucks.
How long is Interstate 605 over Walnut Creek?
The structure is 467 ft (142.2 m) long with a longest span of 72 ft (21.9 m) and a deck 171 ft wide.
Who owns Interstate 605 over Walnut Creek?
It is owned by the State Highway Agency.