Alderpoint RD over South Dobbyn Creek
PoorHumboldt County, California · 2.1 MI N Alderpoint · Structure no. 04C0169
- Built
- 1937
- 88 years old
- Condition
- Poor
- inspected February 2024
- Type
- Tee Beam
- Concrete
- Length
- 58 ft
- 1 main span
- Daily traffic
- 281
- 2008 count
- Owner
- County
- County Highway Agency
About this bridge
Alderpoint RD over South Dobbyn Creek is a concrete tee beam carrying Alderpoint RD over South Dobbyn Creek in Humboldt County, California. It was built in 1937, so it is 88 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 281 vehicles a day, roughly 5% of them trucks, projected to reach 327 by 2042. The structure is 58 ft (17.7 m) long and 20 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 Alderpoint RD over South Dobbyn Creek built?
It was built in 1937, making it 88 years old in 2025.
What condition is Alderpoint RD over South Dobbyn Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.
How much traffic does Alderpoint RD over South Dobbyn Creek carry?
About 281 vehicles per day (2008 count), of which roughly 5% are trucks.
How long is Alderpoint RD over South Dobbyn Creek?
The structure is 58 ft (17.7 m) long with a longest span of 56 ft (17.1 m) and a deck 20 ft wide.
Who owns Alderpoint RD over South Dobbyn Creek?
It is owned by the County Highway Agency.