US Bridges

I-405 over Bnrr & 115 Ave NE

Fair

King County, Washington · 0.2 N JCT SR 520 · Structure no. 0004609B0000000

Built
1954
71 years old, rebuilt 1993
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete Continuous
Length
203 ft
3 main spans
Daily traffic
67,108
2023 count
Owner
State
State Highway Agency

About this bridge

I-405 over Bnrr & 115 Ave NE is a concrete continuous tee beam carrying I-405 over Bnrr & 115 Ave NE in King County, Washington. It was built in 1954 and reconstructed in 1993, so it is 71 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 67,108 vehicles a day, roughly 6% of them trucks, projected to reach 105,460 by 2039. The structure is 203 ft (61.9 m) long and 71 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-405
CrossesBnrr & 115 Ave NE
Location0.2 N JCT SR 520
RouteInterstate 405
CountyKing County
StateWashington
Coordinates47.6351, -122.18734
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 inspectionFebruary 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length203 ft (61.9 m)
Longest span80 ft (24.4 m)
Deck width71 ft (21.6 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic67,108 (2023)
Projected traffic105,460 by 2039
Trucks6%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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$6.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-405 over Bnrr & 115 Ave NE built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1993.

What condition is I-405 over Bnrr & 115 Ave NE 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 February 2023.

How much traffic does I-405 over Bnrr & 115 Ave NE carry?

About 67,108 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-405 over Bnrr & 115 Ave NE?

The structure is 203 ft (61.9 m) long with a longest span of 80 ft (24.4 m) and a deck 71 ft wide.

Who owns I-405 over Bnrr & 115 Ave NE?

It is owned by the State Highway Agency.