US Bridges

I-405 over NE 3rd ST

Fair

King County, Washington · 0.2 N JCT SR 169 · Structure no. 0014052G0000000

Built
1993
32 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
111 ft
1 main span
Daily traffic
64,434
2023 count
Owner
State
State Highway Agency

About this bridge

I-405 over NE 3rd ST is a prestressed concrete stringer/multi-beam or girder carrying I-405 over NE 3rd ST in King County, Washington. It was built in 1993, so it is 32 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 5 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 64,434 vehicles a day, roughly 6% of them trucks, projected to reach 93,770 by 2039. The structure is 111 ft (33.8 m) long and 149 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-405
CrossesNE 3rd ST
Location0.2 N JCT SR 169
RouteInterstate 405
CountyKing County
StateWashington
Coordinates47.48589, -122.19472
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length111 ft (33.8 m)
Longest span106 ft (32.3 m)
Deck width149 ft (45.4 m)
Roadway width144 ft (43.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64,434 (2023)
Projected traffic93,770 by 2039
Trucks6%
Lanes on structure7
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$7.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-405 over NE 3rd ST built?

It was built in 1993, making it 32 years old in 2025.

What condition is I-405 over NE 3rd ST 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 June 2023.

How much traffic does I-405 over NE 3rd ST carry?

About 64,434 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-405 over NE 3rd ST?

The structure is 111 ft (33.8 m) long with a longest span of 106 ft (32.3 m) and a deck 149 ft wide.

Who owns I-405 over NE 3rd ST?

It is owned by the State Highway Agency.