US Bridges

8th Ave N to I-5 N over I-5 N Ramp to SR 522 E

Fair

King County, Washington · 2.2 N JCT SR 520 · Structure no. 0006911B0000000

Built
1963
62 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
182 ft
3 main spans
Daily traffic
5,197
2022 count
Owner
State
State Highway Agency

About this bridge

8th Ave N to I-5 N over I-5 N Ramp to SR 522 E is a concrete continuous box beam or girders - multiple carrying 8th Ave N to I-5 N over I-5 N Ramp to SR 522 E in King County, Washington. It was built in 1963, so it is 62 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 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 5,197 vehicles a day, roughly 5% of them trucks, projected to reach 7,701 by 2039. The structure is 182 ft (55.5 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries8th Ave N to I-5 N
CrossesI-5 N Ramp to SR 522 E
Location2.2 N JCT SR 520
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.67961, -122.32008
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
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 rating65 US tons
Inventory rating38 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length182 ft (55.5 m)
Longest span77 ft (23.5 m)
Deck width26 ft (7.8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,197 (2022)
Projected traffic7,701 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$2.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 8th Ave N to I-5 N over I-5 N Ramp to SR 522 E built?

It was built in 1963, making it 62 years old in 2025.

What condition is 8th Ave N to I-5 N over I-5 N Ramp to SR 522 E 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 8th Ave N to I-5 N over I-5 N Ramp to SR 522 E carry?

About 5,197 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is 8th Ave N to I-5 N over I-5 N Ramp to SR 522 E?

The structure is 182 ft (55.5 m) long with a longest span of 77 ft (23.5 m) and a deck 26 ft wide.

Who owns 8th Ave N to I-5 N over I-5 N Ramp to SR 522 E?

It is owned by the State Highway Agency.