SR 20 over Colonial Creek
GoodWhatcom County, Washington · 13.4 E Skagit CO · Structure no. 0006585A0000000
- Built
- 1961
- 64 years old
- Condition
- Good
- inspected July 2022
- Type
- Tee Beam
- Concrete Continuous
- Length
- 115 ft
- 3 main spans
- Daily traffic
- 1,322
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 20 over Colonial Creek is a concrete continuous tee beam carrying SR 20 over Colonial Creek in Whatcom County, Washington. It was built in 1961, so it is 64 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 1,322 vehicles a day, roughly 8% of them trucks, projected to reach 1,927 by 2039. The structure is 115 ft (35.1 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 20 over Colonial Creek built?
It was built in 1961, making it 64 years old in 2025.
What condition is SR 20 over Colonial Creek 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 2022.
How much traffic does SR 20 over Colonial Creek carry?
About 1,322 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is SR 20 over Colonial Creek?
The structure is 115 ft (35.1 m) long with a longest span of 75 ft (22.9 m) and a deck 31 ft wide.
Who owns SR 20 over Colonial Creek?
It is owned by the State Highway Agency.