State Route 99 SB over Atwater Bl UP RR SP Av
GoodMerced County, California · 10-MER-099-21.61 · Structure no. 39 0126L
- Built
- 1957
- 68 years old, rebuilt 1988
- Condition
- Good
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 550 ft
- 7 main spans
- Daily traffic
- 19,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 SB over Atwater Bl UP RR SP Av is a steel stringer/multi-beam or girder carrying State Route 99 SB over Atwater Bl UP RR SP Av in Merced County, California. It was built in 1957 and reconstructed in 1988, so it is 68 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 19,500 vehicles a day, roughly 18% of them trucks, projected to reach 32,758 by 2046. The structure is 550 ft (167.6 m) long and 42 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 SB over Atwater Bl UP RR SP Av built?
It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1988.
What condition is State Route 99 SB over Atwater Bl UP RR SP Av 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 April 2024.
How much traffic does State Route 99 SB over Atwater Bl UP RR SP Av carry?
About 19,500 vehicles per day (2009 count), of which roughly 18% are trucks.
How long is State Route 99 SB over Atwater Bl UP RR SP Av?
The structure is 550 ft (167.6 m) long with a longest span of 88 ft (26.9 m) and a deck 42 ft wide.
Who owns State Route 99 SB over Atwater Bl UP RR SP Av?
It is owned by the State Highway Agency.