Old State Route 99 over Farmdale Slough
FairMerced County, California · 0.2 MI Se/O E Mission Av · Structure no. 39C0393
- Built
- 1938
- 87 years old, rebuilt 1998
- Condition
- Fair
- inspected January 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 27 ft
- 3 main spans
- Daily traffic
- 270
- 2018 count
- Owner
- County
- County Highway Agency
About this bridge
Old State Route 99 over Farmdale Slough is a concrete continuous culvert carrying Old State Route 99 over Farmdale Slough in Merced County, California. It was built in 1938 and reconstructed in 1998, so it is 87 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 270 vehicles a day, projected to reach 1,131 by 2044. The structure is 27 ft (8.3 m) long and 90 ft wide. If it were closed, the detour would be 5 mi (8 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old State Route 99 over Farmdale Slough built?
It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1998.
What condition is Old State Route 99 over Farmdale Slough in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.
How much traffic does Old State Route 99 over Farmdale Slough carry?
About 270 vehicles per day (2018 count).
How long is Old State Route 99 over Farmdale Slough?
The structure is 27 ft (8.3 m) long with a longest span of 8 ft (2.4 m) and a deck 90 ft wide.
Who owns Old State Route 99 over Farmdale Slough?
It is owned by the County Highway Agency.