US Highway 101 SB over Elk River
FairHumboldt County, California · 01-HUM-101-74.60 · Structure no. 04 0021L
- Built
- 1956
- 69 years old, rebuilt 1983
- Condition
- Fair
- inspected September 2023
- Type
- Slab
- Prestressed Concrete
- Length
- 171 ft
- 5 main spans
- Daily traffic
- 16,200
- 2010 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 SB over Elk River is a prestressed concrete slab carrying US Highway 101 SB over Elk River in Humboldt County, California. It was built in 1956 and reconstructed in 1983, so it is 69 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 16,200 vehicles a day, roughly 9% of them trucks, projected to reach 35,982 by 2041. The structure is 171 ft (52.2 m) long and 58 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 Elk River built?
It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1983.
What condition is US Highway 101 SB over Elk River 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 2023.
How much traffic does US Highway 101 SB over Elk River carry?
About 16,200 vehicles per day (2010 count), of which roughly 9% are trucks.
How long is US Highway 101 SB over Elk River?
The structure is 171 ft (52.2 m) long with a longest span of 34 ft (10.4 m) and a deck 58 ft wide.
Who owns US Highway 101 SB over Elk River?
It is owned by the State Highway Agency.