US Bridges

77th Ave SE over I-90

Good

King County, Washington · 4.2 E JCT I-5 · Structure no. 0013192B0000000

Built
1989
36 years old
Condition
Good
inspected March 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
287 ft
3 main spans
Daily traffic
11,507
2002 count
Owner
State
State Highway Agency

About this bridge

77th Ave SE over I-90 is a concrete continuous box beam or girders - multiple carrying 77th Ave SE over I-90 in King County, Washington. It was built in 1989, so it is 36 years old, younger 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 11,507 vehicles a day, roughly 2% of them trucks. The structure is 287 ft (87.5 m) long and 134 ft wide.

Location

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Carries77th Ave SE
CrossesI-90
Location4.2 E JCT I-5
RouteCity Street 0
CountyKing County
StateWashington
Coordinates47.58831, -122.23489
Functional classUrban Collector

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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating41 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length287 ft (87.5 m)
Longest span107 ft (32.6 m)
Deck width134 ft (40.8 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,507 (2002)
Projected traffic—
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 77th Ave SE over I-90 built?

It was built in 1989, making it 36 years old in 2025.

What condition is 77th Ave SE over I-90 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 March 2024.

How much traffic does 77th Ave SE over I-90 carry?

About 11,507 vehicles per day (2002 count), of which roughly 2% are trucks.

How long is 77th Ave SE over I-90?

The structure is 287 ft (87.5 m) long with a longest span of 107 ft (32.6 m) and a deck 134 ft wide.

Who owns 77th Ave SE over I-90?

It is owned by the State Highway Agency.