State Route 99 NB over Franklin Slough
GoodMerced County, California · 10-MER-099-18.06 · Structure no. 39 0016R
- Built
- 1947
- 78 years old, rebuilt 1974
- Condition
- Good
- inspected April 2024
- Type
- Slab
- Concrete Continuous
- Length
- 93 ft
- 5 main spans
- Daily traffic
- 28,000
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 NB over Franklin Slough is a concrete continuous slab carrying State Route 99 NB over Franklin Slough in Merced County, California. It was built in 1947 and reconstructed in 1974, so it is 78 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 28,000 vehicles a day, roughly 20% of them trucks, projected to reach 42,931 by 2046. The structure is 93 ft (28.4 m) long and 36 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 NB over Franklin Slough built?
It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1974.
What condition is State Route 99 NB over Franklin Slough 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 NB over Franklin Slough carry?
About 28,000 vehicles per day (2019 count), of which roughly 20% are trucks.
How long is State Route 99 NB over Franklin Slough?
The structure is 93 ft (28.4 m) long with a longest span of 20 ft (6.1 m) and a deck 36 ft wide.
Who owns State Route 99 NB over Franklin Slough?
It is owned by the State Highway Agency.