US Highway 101 SB over Eureka Slough
FairHumboldt County, California · 01-HUM-101-79.78-EUR · Structure no. 04 0022L
- Built
- 1943
- 82 years old
- Condition
- Fair
- inspected January 2025
- Type
- Truss - Thru
- Steel
- Length
- 884 ft
- 2 main spans
- Daily traffic
- 17,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 SB over Eureka Slough is a steel truss - thru carrying US Highway 101 SB over Eureka Slough in Humboldt County, California. It was built in 1943, so it is 82 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 5 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 17,000 vehicles a day, roughly 7% of them trucks, projected to reach 26,229 by 2043. The structure is 884 ft (269.4 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US Highway 101 SB over Eureka Slough built?
It was built in 1943, making it 82 years old in 2025.
What condition is US Highway 101 SB over Eureka Slough 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 January 2025.
How much traffic does US Highway 101 SB over Eureka Slough carry?
About 17,000 vehicles per day (2009 count), of which roughly 7% are trucks.
How long is US Highway 101 SB over Eureka Slough?
The structure is 884 ft (269.4 m) long with a longest span of 102 ft (31.1 m) and a deck 37 ft wide.
Who owns US Highway 101 SB over Eureka Slough?
It is owned by the State Highway Agency.