State Route 99 over Herndon Canal
FairFresno County, California · 06-FRE-099-28.40-FRE · Structure no. 42 0129
- Built
- 1960
- 65 years old, rebuilt 2012
- Condition
- Fair
- inspected November 2023
- Type
- Slab
- Concrete Continuous
- Length
- 65 ft
- 2 main spans
- Daily traffic
- 32,500
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 over Herndon Canal is a concrete continuous slab carrying State Route 99 over Herndon Canal in Fresno County, California. It was built in 1960 and reconstructed in 2012, so it is 65 years old, older 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 6 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 32,500 vehicles a day, roughly 24% of them trucks, projected to reach 61,162 by 2040. The structure is 65 ft (19.8 m) long and 143 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 over Herndon Canal built?
It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2012.
What condition is State Route 99 over Herndon Canal 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 November 2023.
How much traffic does State Route 99 over Herndon Canal carry?
About 32,500 vehicles per day (2019 count), of which roughly 24% are trucks.
How long is State Route 99 over Herndon Canal?
The structure is 65 ft (19.8 m) long with a longest span of 31 ft (9.4 m) and a deck 143 ft wide.
Who owns State Route 99 over Herndon Canal?
It is owned by the State Highway Agency.