State Route 99 over Mosher Slough
GoodSan Joaquin County, California · 10-SJ-099-24.41 · Structure no. 29 0006
- Built
- 1930
- 95 years old, rebuilt 1964
- Condition
- Good
- inspected June 2024
- Type
- Tee Beam
- Concrete
- Length
- 81 ft
- 3 main spans
- Daily traffic
- 64,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 over Mosher Slough is a concrete tee beam carrying State Route 99 over Mosher Slough in San Joaquin County, California. It was built in 1930 and reconstructed in 1964, so it is 95 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 64,000 vehicles a day, projected to reach 138,486 by 2046. The structure is 81 ft (24.7 m) long and 114 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 |
|---|---|---|
| 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 State Route 99 over Mosher Slough built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1964.
What condition is State Route 99 over Mosher 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 June 2024.
How much traffic does State Route 99 over Mosher Slough carry?
About 64,000 vehicles per day (2009 count).
How long is State Route 99 over Mosher Slough?
The structure is 81 ft (24.7 m) long with a longest span of 27 ft (8.2 m) and a deck 114 ft wide.
Who owns State Route 99 over Mosher Slough?
It is owned by the State Highway Agency.