State Route 99 SB over Zeff RD & Tuolumne River
GoodStanislaus County, California · 10-STA-099-R14.93-MOD · Structure no. 38 0078L
- Built
- 1963
- 62 years old
- Condition
- Good
- inspected September 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 702 ft
- 8 main spans
- Daily traffic
- 52,500
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 SB over Zeff RD & Tuolumne River is a concrete continuous box beam or girders - multiple carrying State Route 99 SB over Zeff RD & Tuolumne River in Stanislaus County, California. It was built in 1963, so it is 62 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 52,500 vehicles a day, roughly 12% of them trucks, projected to reach 64,830 by 2040. The structure is 702 ft (214 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 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 SB over Zeff RD & Tuolumne River built?
It was built in 1963, making it 62 years old in 2025.
What condition is State Route 99 SB over Zeff RD & Tuolumne 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 September 2023.
How much traffic does State Route 99 SB over Zeff RD & Tuolumne River carry?
About 52,500 vehicles per day (2015 count), of which roughly 12% are trucks.
How long is State Route 99 SB over Zeff RD & Tuolumne River?
The structure is 702 ft (214 m) long with a longest span of 96 ft (29.3 m) and a deck 46 ft wide.
Who owns State Route 99 SB over Zeff RD & Tuolumne River?
It is owned by the State Highway Agency.