4th Ave S over Argo RR Yard
PoorPosted for loadKing County, Washington · 4700 4th Ave S · Structure no. 085273000000000
- Built
- 1933
- 92 years old, rebuilt 1985
- Condition
- Poor
- inspected July 2023
- Type
- Girder and Floorbeam System
- Steel
- Length
- 1,741 ft
- 12 main spans
- Daily traffic
- 28,000
- 2018 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
4th Ave S over Argo RR Yard is a steel girder and floorbeam system carrying 4th Ave S over Argo RR Yard in King County, Washington. It was built in 1933 and reconstructed in 1985, so it is 92 years old, older than the Washington average of 49.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for other load-capacity restriction.
It carries about 28,000 vehicles a day, roughly 10% of them trucks, projected to reach 32,000 by 2038. The structure is 1,741 ft (530.7 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 4th Ave S over Argo RR Yard built?
It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1985.
What condition is 4th Ave S over Argo RR Yard in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2023.
How much traffic does 4th Ave S over Argo RR Yard carry?
About 28,000 vehicles per day (2018 count), of which roughly 10% are trucks.
How long is 4th Ave S over Argo RR Yard?
The structure is 1,741 ft (530.7 m) long with a longest span of 96 ft (29.3 m) and a deck 52 ft wide.
Who owns 4th Ave S over Argo RR Yard?
It is owned by the City or Municipal Highway Agency.