US Bridges

I-405 Ramp over EB I-90 Ramp

Good

King County, Washington · 5.7 N JCT SR 900 · Structure no. 0008190H0000000

Built
1969
56 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
36,070
2023 count
Owner
State
State Highway Agency

About this bridge

I-405 Ramp over EB I-90 Ramp is a prestressed concrete stringer/multi-beam or girder carrying I-405 Ramp over EB I-90 Ramp in King County, Washington. It was built in 1969, so it is 56 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 36,070 vehicles a day, roughly 5% of them trucks, projected to reach 59,392 by 2039. The structure is 82 ft (25 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-405 Ramp
CrossesEB I-90 Ramp
Location5.7 N JCT SR 900
RouteInterstate 405
CountyKing County
StateWashington
Coordinates47.57986, -122.17111
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length82 ft (25 m)
Longest span77 ft (23.5 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,070 (2023)
Projected traffic59,392 by 2039
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-405 Ramp over EB I-90 Ramp built?

It was built in 1969, making it 56 years old in 2025.

What condition is I-405 Ramp over EB I-90 Ramp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does I-405 Ramp over EB I-90 Ramp carry?

About 36,070 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is I-405 Ramp over EB I-90 Ramp?

The structure is 82 ft (25 m) long with a longest span of 77 ft (23.5 m) and a deck 36 ft wide.

Who owns I-405 Ramp over EB I-90 Ramp?

It is owned by the State Highway Agency.