U.S. Highway 101 over Jones Slough
FairHumboldt County, California · 01-HUM-101-88.87 · Structure no. 04 0083
- Built
- 1959
- 66 years old, rebuilt 1991
- Condition
- Fair
- inspected November 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 132 ft
- 4 main spans
- Daily traffic
- 12,900
- 2010 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over Jones Slough is a concrete continuous tee beam carrying U.S. Highway 101 over Jones Slough in Humboldt County, California. It was built in 1959 and reconstructed in 1991, so it is 66 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 12,900 vehicles a day, roughly 10% of them trucks, projected to reach 42,788 by 2041. The structure is 132 ft (40.2 m) long and 94 ft wide.
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was U.S. Highway 101 over Jones Slough built?
It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1991.
What condition is U.S. Highway 101 over Jones 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 November 2023.
How much traffic does U.S. Highway 101 over Jones Slough carry?
About 12,900 vehicles per day (2010 count), of which roughly 10% are trucks.
How long is U.S. Highway 101 over Jones Slough?
The structure is 132 ft (40.2 m) long with a longest span of 36 ft (11 m) and a deck 94 ft wide.
Who owns U.S. Highway 101 over Jones Slough?
It is owned by the State Highway Agency.