Usona Road over Middle Fk Chowchilla Riv
PoorMariposa County, California · 2.2 MI South of SR 49 · Structure no. 40C0066
- Built
- 1970
- 55 years old
- Condition
- Poor
- inspected September 2023
- Type
- Slab
- Concrete Continuous
- Length
- 42 ft
- 2 main spans
- Daily traffic
- 190
- 1988 count
- Owner
- County
- County Highway Agency
About this bridge
Usona Road over Middle Fk Chowchilla Riv is a concrete continuous slab carrying Usona Road over Middle Fk Chowchilla Riv in Mariposa County, California. It was built in 1970, so it is 55 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 190 vehicles a day, roughly 3% of them trucks, projected to reach 535 by 2040. The structure is 42 ft (12.9 m) long and 14 ft wide. If it were closed, the detour would be 11.8 mi (19 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Usona Road over Middle Fk Chowchilla Riv built?
It was built in 1970, making it 55 years old in 2025.
What condition is Usona Road over Middle Fk Chowchilla Riv in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.
How much traffic does Usona Road over Middle Fk Chowchilla Riv carry?
About 190 vehicles per day (1988 count), of which roughly 3% are trucks.
How long is Usona Road over Middle Fk Chowchilla Riv?
The structure is 42 ft (12.9 m) long with a longest span of 20 ft (6.1 m) and a deck 14 ft wide.
Who owns Usona Road over Middle Fk Chowchilla Riv?
It is owned by the County Highway Agency.