US Bridges

I-405 N-E Ramp over 116th Ave NE

Good

King County, Washington · JCT SR 520 · Structure no. 0014039B0000000

Built
1993
32 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
165 ft
3 main spans
Daily traffic
32,900
2023 count
Owner
State
State Highway Agency

About this bridge

I-405 N-E Ramp over 116th Ave NE is a prestressed concrete continuous stringer/multi-beam or girder carrying I-405 N-E Ramp over 116th Ave NE in King County, Washington. It was built in 1993, so it is 32 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 32,900 vehicles a day, roughly 5% of them trucks, projected to reach 49,821 by 2039. The structure is 165 ft (50.3 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-405 N-E Ramp
Crosses116th Ave NE
LocationJCT SR 520
RouteInterstate 405
CountyKing County
StateWashington
Coordinates47.63172, -122.186
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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length165 ft (50.3 m)
Longest span61 ft (18.6 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,900 (2023)
Projected traffic49,821 by 2039
Trucks5%
Lanes on structure1
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 statusHistorical significance not determinable at this time
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 I-405 N-E Ramp over 116th Ave NE built?

It was built in 1993, making it 32 years old in 2025.

What condition is I-405 N-E Ramp over 116th Ave NE 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 April 2024.

How much traffic does I-405 N-E Ramp over 116th Ave NE carry?

About 32,900 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is I-405 N-E Ramp over 116th Ave NE?

The structure is 165 ft (50.3 m) long with a longest span of 61 ft (18.6 m) and a deck 29 ft wide.

Who owns I-405 N-E Ramp over 116th Ave NE?

It is owned by the State Highway Agency.