State Route 59 over Mariposa Creek
FairMerced County, California · 10-MER-059-10.38 · Structure no. 39 0063
- Built
- 1925
- 100 years old, rebuilt 1955
- Condition
- Fair
- inspected May 2024
- Type
- Slab
- Concrete Continuous
- Length
- 76 ft
- 4 main spans
- Daily traffic
- 7,700
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 59 over Mariposa Creek is a concrete continuous slab carrying State Route 59 over Mariposa Creek in Merced County, California. It was built in 1925 and reconstructed in 1955, so it is 100 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 5 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 7,700 vehicles a day, projected to reach 14,701 by 2046. The structure is 76 ft (23.1 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 59 over Mariposa Creek built?
It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1955.
What condition is State Route 59 over Mariposa Creek 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 May 2024.
How much traffic does State Route 59 over Mariposa Creek carry?
About 7,700 vehicles per day (2009 count).
How long is State Route 59 over Mariposa Creek?
The structure is 76 ft (23.1 m) long with a longest span of 19 ft (5.7 m) and a deck 40 ft wide.
Who owns State Route 59 over Mariposa Creek?
It is owned by the State Highway Agency.