US Bridges

I-90 over High Point RD

Fair

King County, Washington · 4.4 E JCT SR 900 · Structure no. 0009733B0000000

Built
1975
50 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
140 ft
1 main span
Daily traffic
33,894
2023 count
Owner
State
State Highway Agency

About this bridge

I-90 over High Point RD is a prestressed concrete stringer/multi-beam or girder carrying I-90 over High Point RD in King County, Washington. It was built in 1975, so it is 50 years old, older 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 33,894 vehicles a day, roughly 7% of them trucks, projected to reach 51,569 by 2039. The structure is 140 ft (42.7 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-90
CrossesHigh Point RD
Location4.4 E JCT SR 900
RouteInterstate 90
CountyKing County
StateWashington
Coordinates47.53142, -121.98028
Functional classRural 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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length140 ft (42.7 m)
Longest span135 ft (41.1 m)
Deck width55 ft (16.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,894 (2023)
Projected traffic51,569 by 2039
Trucks7%
Lanes on structure3
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-90 over High Point RD built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-90 over High Point RD 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 May 2023.

How much traffic does I-90 over High Point RD carry?

About 33,894 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-90 over High Point RD?

The structure is 140 ft (42.7 m) long with a longest span of 135 ft (41.1 m) and a deck 55 ft wide.

Who owns I-90 over High Point RD?

It is owned by the State Highway Agency.