Myrtle Ave over Ryan Slough
GoodHumboldt County, California · 2.9 MI E Intx Wth US 101 · Structure no. 04C0083
- Built
- 1955
- 70 years old, rebuilt 2009
- Condition
- Good
- inspected June 2023
- Type
- Slab
- Concrete Continuous
- Length
- 161 ft
- 8 main spans
- Daily traffic
- 8,530
- 2011 count
- Owner
- County
- County Highway Agency
About this bridge
Myrtle Ave over Ryan Slough is a concrete continuous slab carrying Myrtle Ave over Ryan Slough in Humboldt County, California. It was built in 1955 and reconstructed in 2009, so it is 70 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 8,530 vehicles a day, roughly 5% of them trucks, projected to reach 7,340 by 2045. The structure is 161 ft (49.1 m) long and 36 ft wide. If it were closed, the detour would be 18 mi (29 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 Myrtle Ave over Ryan Slough built?
It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2009.
What condition is Myrtle Ave over Ryan Slough in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.
How much traffic does Myrtle Ave over Ryan Slough carry?
About 8,530 vehicles per day (2011 count), of which roughly 5% are trucks.
How long is Myrtle Ave over Ryan Slough?
The structure is 161 ft (49.1 m) long with a longest span of 21 ft (6.4 m) and a deck 36 ft wide.
Who owns Myrtle Ave over Ryan Slough?
It is owned by the County Highway Agency.