State Route 99 SB over Mariposa Creek
GoodMerced County, California · 10-MER-099-9.35 · Structure no. 39 0245L
- Built
- 2015
- 10 years old
- Condition
- Good
- inspected April 2024
- Type
- Slab
- Concrete Continuous
- Length
- 76 ft
- 2 main spans
- Daily traffic
- 19,500
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 SB over Mariposa Creek is a concrete continuous slab carrying State Route 99 SB over Mariposa Creek in Merced County, California. It was built in 2015, so it is 10 years old, younger 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, projected to reach 29,029 by 2046. The structure is 76 ft (23.2 m) long and 59 ft wide. If it were closed, the detour would be 8.7 mi (14 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 | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 SB over Mariposa Creek built?
It was built in 2015, making it 10 years old in 2025.
What condition is State Route 99 SB over Mariposa Creek 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 Mariposa Creek carry?
About 19,500 vehicles per day (2009 count).
How long is State Route 99 SB over Mariposa Creek?
The structure is 76 ft (23.2 m) long with a longest span of 38 ft (11.6 m) and a deck 59 ft wide.
Who owns State Route 99 SB over Mariposa Creek?
It is owned by the State Highway Agency.