US Bridges

NE 4th ST over I-405

Fair

King County, Washington · 2.4 N JCT I-90 · Structure no. 0016549A0000000

Built
2003
22 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
224 ft
2 main spans
Daily traffic
29,600
2013 count
Owner
State
State Highway Agency

About this bridge

NE 4th ST over I-405 is a prestressed concrete continuous stringer/multi-beam or girder carrying NE 4th ST over I-405 in King County, Washington. It was built in 2003, so it is 22 years old, younger 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.

It carries about 29,600 vehicles a day, roughly 6% of them trucks, projected to reach 53,536 by 2037. The structure is 224 ft (68.3 m) long and 111 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNE 4th ST
CrossesI-405
Location2.4 N JCT I-90
RouteCity Street 405
CountyKing County
StateWashington
Coordinates47.61372, -122.19003
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating62.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length224 ft (68.3 m)
Longest span116 ft (35.4 m)
Deck width111 ft (33.7 m)
Roadway width85 ft (26 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,600 (2013)
Projected traffic53,536 by 2037
Trucks6%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$9.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NE 4th ST over I-405 built?

It was built in 2003, making it 22 years old in 2025.

What condition is NE 4th ST over I-405 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 February 2023.

How much traffic does NE 4th ST over I-405 carry?

About 29,600 vehicles per day (2013 count), of which roughly 6% are trucks.

How long is NE 4th ST over I-405?

The structure is 224 ft (68.3 m) long with a longest span of 116 ft (35.4 m) and a deck 111 ft wide.

Who owns NE 4th ST over I-405?

It is owned by the State Highway Agency.