42ND AVE SO
Carrying 42ND AVE SO over DUWAMISH RIVER
0.04 MI E OF SR-599, King, Washington
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: 42ND AVE SO
The 42ND AVE SO bridge in King, Washington carries 42ND AVE SO over DUWAMISH RIVER. It was built in 1949, making it 77 years old today. The structure is built primarily of steel and spans 1 section, stretching 86.6 meters (284 feet) end to end. Daily traffic averages 3,185 vehicles, placing it in the moderately-trafficked tier of Washington bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 4/9. The weakest component sits in poor condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order. Its NBI inventory load rating is 10.0 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How 42ND AVE SO compares
Live comparison across Washington.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1949
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 86.6 m (284 ft)
- Deck Width
- 9.1 m (30 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 3,185 vehicles/day
- Structure Number
- 081097000000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • At 4/9, the substructure (piers and abutments) is in poor shape, with advanced wear flagged for priority repair.
How to read this record
42ND AVE SO is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare 42ND AVE SO against other structures in King and across Washington. Washington bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for 42ND AVE SO?
42ND AVE SO in King, Washington has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is 42ND AVE SO inspected?
42ND AVE SO's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 3,185 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 42ND AVE SO is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for 42ND AVE SO?
42ND AVE SO has an NBI inventory load rating of 10.0 metric tons.
Who is responsible for maintaining 42ND AVE SO?
42ND AVE SO is owned and maintained by City/Municipal Highway Agency.
How old is 42ND AVE SO and does age affect safety?
42ND AVE SO was built in 1949, making it 77 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.