Alderpoint Road over US Highway 101
FairHumboldt County, California · 01-HUM-101-R11.77 · Structure no. 04 0197
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 199 ft
- 3 main spans
- Daily traffic
- 1,120
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
Alderpoint Road over US Highway 101 is a concrete continuous box beam or girders - multiple carrying Alderpoint Road over US Highway 101 in Humboldt County, California. It was built in 1966, so it is 59 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 1,120 vehicles a day, roughly 2% of them trucks, projected to reach 3,666 by 2041. The structure is 199 ft (60.7 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Alderpoint Road over US Highway 101 built?
It was built in 1966, making it 59 years old in 2025.
What condition is Alderpoint Road over US Highway 101 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 Alderpoint Road over US Highway 101 carry?
About 1,120 vehicles per day (2014 count), of which roughly 2% are trucks.
How long is Alderpoint Road over US Highway 101?
The structure is 199 ft (60.7 m) long with a longest span of 80 ft (24.4 m) and a deck 34 ft wide.
Who owns Alderpoint Road over US Highway 101?
It is owned by the State Highway Agency.