Ferndale RD over Slough
GoodWhatcom County, Washington · 01.7 S. Slater Rd. · Structure no. 080774000000000
- Built
- 1979
- 46 years old
- Condition
- Good
- inspected February 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 90 ft
- 1 main span
- Daily traffic
- 1,643
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Ferndale RD over Slough is a prestressed concrete tee beam carrying Ferndale RD over Slough in Whatcom County, Washington. It was built in 1979, so it is 46 years old, younger than the Washington average of 49.8 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 1,643 vehicles a day, roughly 7% of them trucks, projected to reach 2,100 by 2043. The structure is 90 ft (27.4 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ferndale RD over Slough built?
It was built in 1979, making it 46 years old in 2025.
What condition is Ferndale RD over 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 February 2023.
How much traffic does Ferndale RD over Slough carry?
About 1,643 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is Ferndale RD over Slough?
The structure is 90 ft (27.4 m) long with a longest span of 90 ft (27.4 m) and a deck 32 ft wide.
Who owns Ferndale RD over Slough?
It is owned by the County Highway Agency.