State Route 99 over French Camp Slough
FairSan Joaquin County, California · 10-SJ-099-12.33 · Structure no. 29 0019
- Built
- 1955
- 70 years old, rebuilt 2014
- Condition
- Fair
- inspected June 2024
- Type
- Slab
- Concrete Continuous
- Length
- 78 ft
- 4 main spans
- Daily traffic
- 35,250
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 over French Camp Slough is a concrete continuous slab carrying State Route 99 over French Camp Slough in San Joaquin County, California. It was built in 1955 and reconstructed in 2014, so it is 70 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 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 35,250 vehicles a day, roughly 13% of them trucks, projected to reach 46,978 by 2046. The structure is 78 ft (23.9 m) long and 111 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 over French Camp Slough built?
It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2014.
What condition is State Route 99 over French Camp Slough 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 June 2024.
How much traffic does State Route 99 over French Camp Slough carry?
About 35,250 vehicles per day (2009 count), of which roughly 13% are trucks.
How long is State Route 99 over French Camp Slough?
The structure is 78 ft (23.9 m) long with a longest span of 20 ft (6.2 m) and a deck 111 ft wide.
Who owns State Route 99 over French Camp Slough?
It is owned by the State Highway Agency.