Happy Isles Loop over Merced River
FairMariposa County, California · Approximately 500 Downst · Structure no. 8800009S0000000
- Built
- 1929
- 96 years old
- Condition
- Fair
- inspected September 2024
- Type
- Arch - Deck
- Concrete
- Length
- 124 ft
- 3 main spans
- Daily traffic
- 50
- 2019 count
- Owner
- Federal
- National Park Service
About this bridge
Happy Isles Loop over Merced River is a concrete arch - deck carrying Happy Isles Loop over Merced River in Mariposa County, California. It was built in 1929, so it is 96 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 50 vehicles a day, roughly 1% of them trucks, projected to reach 100 by 2039. The structure is 124 ft (37.8 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Happy Isles Loop over Merced River built?
It was built in 1929, making it 96 years old in 2025.
What condition is Happy Isles Loop over Merced River 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 September 2024.
How much traffic does Happy Isles Loop over Merced River carry?
About 50 vehicles per day (2019 count), of which roughly 1% are trucks.
How long is Happy Isles Loop over Merced River?
The structure is 124 ft (37.8 m) long with a longest span of 75 ft (22.9 m) and a deck 40 ft wide.
Who owns Happy Isles Loop over Merced River?
It is owned by the National Park Service.