State Route 99 over Porter Slough
GoodTulare County, California · 06-TUL-099-23.21 · Structure no. 46 0128
- Built
- 1931
- 94 years old, rebuilt 1962
- Condition
- Good
- inspected August 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 22 ft
- 2 main spans
- Daily traffic
- 43,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 over Porter Slough is a concrete continuous culvert carrying State Route 99 over Porter Slough in Tulare County, California. It was built in 1931 and reconstructed in 1962, so it is 94 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 43,000 vehicles a day, roughly 22% of them trucks, projected to reach 92,936 by 2042. The structure is 22 ft (6.7 m) long and 127 ft wide. If it were closed, the detour would be 1.9 mi (3 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 over Porter Slough built?
It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1962.
What condition is State Route 99 over Porter Slough 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 August 2024.
How much traffic does State Route 99 over Porter Slough carry?
About 43,000 vehicles per day (2009 count), of which roughly 22% are trucks.
How long is State Route 99 over Porter Slough?
The structure is 22 ft (6.7 m) long with a longest span of 11 ft (3.4 m) and a deck 127 ft wide.
Who owns State Route 99 over Porter Slough?
It is owned by the State Highway Agency.