State Route 99 SB over Stanislaus River
FairSan Joaquin County, California · 10-SJ-099-0.00 · Structure no. 29 0013L
- Built
- 1903
- 122 years old, rebuilt 2021
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 1,220 ft
- 2 main spans
- Daily traffic
- 53,500
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 SB over Stanislaus River is a steel stringer/multi-beam or girder carrying State Route 99 SB over Stanislaus River in San Joaquin County, California. It was built in 1903 and reconstructed in 2021, so it is 122 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 53,500 vehicles a day, roughly 20% of them trucks, projected to reach 77,529 by 2046. The structure is 1,220 ft (371.8 m) long and 51 ft wide. If it were closed, the detour would be 23 mi (37 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 SB over Stanislaus River built?
It was built in 1903, making it 122 years old in 2025. It was reconstructed in 2021.
What condition is State Route 99 SB over Stanislaus River 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 October 2024.
How much traffic does State Route 99 SB over Stanislaus River carry?
About 53,500 vehicles per day (2016 count), of which roughly 20% are trucks.
How long is State Route 99 SB over Stanislaus River?
The structure is 1,220 ft (371.8 m) long with a longest span of 101 ft (30.8 m) and a deck 51 ft wide.
Who owns State Route 99 SB over Stanislaus River?
It is owned by the State Highway Agency.