State Route 99 NB over Stanislaus River
GoodSan Joaquin County, California · 10-SJ-099-0.00 · Structure no. 29 0013R
- Built
- 1948
- 77 years old, rebuilt 1970
- Condition
- Good
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 1,293 ft
- 2 main spans
- Daily traffic
- 53,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 NB over Stanislaus River is a steel stringer/multi-beam or girder carrying State Route 99 NB over Stanislaus River in San Joaquin County, California. It was built in 1948 and reconstructed in 1970, so it is 77 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 53,500 vehicles a day, roughly 20% of them trucks, projected to reach 77,529 by 2044. The structure is 1,293 ft (394.1 m) long and 61 ft wide. If it were closed, the detour would be 23 mi (37 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 NB over Stanislaus River built?
It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1970.
What condition is State Route 99 NB over Stanislaus River 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 October 2024.
How much traffic does State Route 99 NB over Stanislaus River carry?
About 53,500 vehicles per day (2009 count), of which roughly 20% are trucks.
How long is State Route 99 NB over Stanislaus River?
The structure is 1,293 ft (394.1 m) long with a longest span of 100 ft (30.5 m) and a deck 61 ft wide.
Who owns State Route 99 NB over Stanislaus River?
It is owned by the State Highway Agency.