U.S. Highway 101 over US 101 On&off Ramp Ncrra
FairHumboldt County, California · 01-HUM-101-70.61 · Structure no. 04 0121
- Built
- 1962
- 63 years old, rebuilt 1982
- Condition
- Fair
- inspected July 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 406 ft
- 4 main spans
- Daily traffic
- 21,700
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over US 101 On&off Ramp Ncrra is a concrete continuous box beam or girders - multiple carrying U.S. Highway 101 over US 101 On&off Ramp Ncrra in Humboldt County, California. It was built in 1962 and reconstructed in 1982, 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 21,700 vehicles a day, roughly 11% of them trucks, projected to reach 28,419 by 2041. The structure is 406 ft (123.9 m) long and 89 ft wide. If it were closed, the detour would be 52.8 mi (85 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was U.S. Highway 101 over US 101 On&off Ramp Ncrra built?
It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1982.
What condition is U.S. Highway 101 over US 101 On&off Ramp 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 July 2023.
How much traffic does U.S. Highway 101 over US 101 On&off Ramp Ncrra carry?
About 21,700 vehicles per day (2009 count), of which roughly 11% are trucks.
How long is U.S. Highway 101 over US 101 On&off Ramp Ncrra?
The structure is 406 ft (123.9 m) long with a longest span of 112 ft (34.1 m) and a deck 89 ft wide.
Who owns U.S. Highway 101 over US 101 On&off Ramp Ncrra?
It is owned by the State Highway Agency.