US Highway 101 over S101-MAIN On&off Ncrra
FairHumboldt County, California · 01-HUM-101-61.53-FTA · Structure no. 04 0145
- Built
- 1962
- 63 years old, rebuilt 1993
- Condition
- Fair
- inspected August 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 457 ft
- 6 main spans
- Daily traffic
- 12,800
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 over S101-MAIN On&off Ncrra is a concrete continuous tee beam carrying US Highway 101 over S101-MAIN On&off Ncrra in Humboldt County, California. It was built in 1962 and reconstructed in 1993, so it is 63 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 12,800 vehicles a day, roughly 11% of them trucks, projected to reach 16,670 by 2045. The structure is 457 ft (139.3 m) long and 80 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US Highway 101 over S101-MAIN On&off Ncrra built?
It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1993.
What condition is US Highway 101 over S101-MAIN On&off Ncrra 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 August 2023.
How much traffic does US Highway 101 over S101-MAIN On&off Ncrra carry?
About 12,800 vehicles per day (2009 count), of which roughly 11% are trucks.
How long is US Highway 101 over S101-MAIN On&off Ncrra?
The structure is 457 ft (139.3 m) long with a longest span of 88 ft (26.8 m) and a deck 80 ft wide.
Who owns US Highway 101 over S101-MAIN On&off Ncrra?
It is owned by the State Highway Agency.