US Bridges

NE 40th ST over SR 520

Fair

King County, Washington · 3.2 E JCT I-405 · Structure no. 0011314A0000000

Built
1980
45 years old, rebuilt 2000
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
219 ft
2 main spans
Daily traffic
26,907
2007 count
Owner
State
State Highway Agency

About this bridge

NE 40th ST over SR 520 is a prestressed concrete continuous stringer/multi-beam or girder carrying NE 40th ST over SR 520 in King County, Washington. It was built in 1980 and reconstructed in 2000, so it is 45 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 26,907 vehicles a day, roughly 5% of them trucks. The structure is 219 ft (66.8 m) long and 118 ft wide.

Location

Open in Google Maps
CarriesNE 40th ST
CrossesSR 520
Location3.2 E JCT I-405
RouteCity Street 0
CountyKing County
StateWashington
Coordinates47.64603, -122.13442
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length219 ft (66.8 m)
Longest span116 ft (35.4 m)
Deck width118 ft (35.9 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,907 (2007)
Projected traffic—
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$10 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NE 40th ST over SR 520 built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 2000.

What condition is NE 40th ST over SR 520 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 September 2023.

How much traffic does NE 40th ST over SR 520 carry?

About 26,907 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is NE 40th ST over SR 520?

The structure is 219 ft (66.8 m) long with a longest span of 116 ft (35.4 m) and a deck 118 ft wide.

Who owns NE 40th ST over SR 520?

It is owned by the State Highway Agency.