SR 20 over Sidehill
GoodWhatcom County, Washington · 8.6 E Skagit CO · Structure no. 0006974E0000000
- Built
- 1962
- 63 years old
- Condition
- Good
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Concrete
- Length
- 82 ft
- 2 main spans
- Daily traffic
- 848
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 20 over Sidehill is a concrete stringer/multi-beam or girder carrying SR 20 over Sidehill in Whatcom County, Washington. It was built in 1962, so it is 63 years old, older 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 848 vehicles a day, roughly 7% of them trucks, projected to reach 1,222 by 2039. The structure is 82 ft (25 m) long and 16 ft wide.
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 | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 20 over Sidehill built?
It was built in 1962, making it 63 years old in 2025.
What condition is SR 20 over Sidehill 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 July 2023.
How much traffic does SR 20 over Sidehill carry?
About 848 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is SR 20 over Sidehill?
The structure is 82 ft (25 m) long with a longest span of 40 ft (12.2 m) and a deck 16 ft wide.
Who owns SR 20 over Sidehill?
It is owned by the State Highway Agency.