Old HWY over Mariposa Creek
FairMariposa County, California · 10-MPA-049-17.25 · Structure no. 40 0050Y
- Built
- 1920
- 105 years old
- Condition
- Fair
- inspected July 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 33 ft
- 2 main spans
- Daily traffic
- 840
- 2001 count
- Owner
- State
- State Highway Agency
About this bridge
Old HWY over Mariposa Creek is a concrete continuous tee beam carrying Old HWY over Mariposa Creek in Mariposa County, California. It was built in 1920, so it is 105 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 840 vehicles a day, roughly 5% of them trucks, projected to reach 2,173 by 2046. The structure is 33 ft (10.1 m) long and 21 ft wide. If it were closed, the detour would be 11.2 mi (18 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Old HWY over Mariposa Creek built?
It was built in 1920, making it 105 years old in 2025.
What condition is Old HWY 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 July 2024.
How much traffic does Old HWY over Mariposa Creek carry?
About 840 vehicles per day (2001 count), of which roughly 5% are trucks.
How long is Old HWY over Mariposa Creek?
The structure is 33 ft (10.1 m) long with a longest span of 16 ft (4.9 m) and a deck 21 ft wide.
Who owns Old HWY over Mariposa Creek?
It is owned by the State Highway Agency.