Blackburn ST over I-5
FairPosted for loadSkagit County, Washington · 4.7 N JCT SR 534 · Structure no. 0004535A0000000
- Built
- 1954
- 71 years old
- Condition
- Fair
- inspected October 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 194 ft
- 5 main spans
- Daily traffic
- 4,314
- 2002 count
- Owner
- State
- State Highway Agency
About this bridge
Blackburn ST over I-5 is a concrete continuous tee beam carrying Blackburn ST over I-5 in Skagit County, Washington. It was built in 1954, so it is 71 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.
It carries about 4,314 vehicles a day, roughly 1% of them trucks, projected to reach 7,981 by 2036. The structure is 194 ft (59.1 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 8 Very Good | No problems noted. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Blackburn ST over I-5 built?
It was built in 1954, making it 71 years old in 2025.
What condition is Blackburn ST over I-5 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 October 2024.
How much traffic does Blackburn ST over I-5 carry?
About 4,314 vehicles per day (2002 count), of which roughly 1% are trucks.
How long is Blackburn ST over I-5?
The structure is 194 ft (59.1 m) long with a longest span of 46 ft (14 m) and a deck 34 ft wide.
Who owns Blackburn ST over I-5?
It is owned by the State Highway Agency.