US Bridges

NE 128th ST over NB I-405

Poor

King County, Washington · 5.7 N JCT SR 520 · Structure no. 0016932B0000000

Built
2006
19 years old
Condition
Poor
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
128 ft
1 main span
Daily traffic
7,766
2007 count
Owner
State
State Highway Agency

About this bridge

NE 128th ST over NB I-405 is a steel stringer/multi-beam or girder carrying NE 128th ST over NB I-405 in King County, Washington. It was built in 2006, so it is 19 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 7,766 vehicles a day, roughly 5% of them trucks. The structure is 128 ft (39 m) long and 118 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNE 128th ST
CrossesNB I-405
Location5.7 N JCT SR 520
RouteCity Street 0
CountyKing County
StateWashington
Coordinates47.71483, -122.18525
Functional classUrban Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length128 ft (39 m)
Longest span128 ft (39 m)
Deck width118 ft (36 m)
Roadway width88 ft (26.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,766 (2007)
Projected traffic—
Trucks5%
Lanes on structure6
Traffic directionTwo-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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$5.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NE 128th ST over NB I-405 built?

It was built in 2006, making it 19 years old in 2025.

What condition is NE 128th ST over NB I-405 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2024.

How much traffic does NE 128th ST over NB I-405 carry?

About 7,766 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is NE 128th ST over NB I-405?

The structure is 128 ft (39 m) long with a longest span of 128 ft (39 m) and a deck 118 ft wide.

Who owns NE 128th ST over NB I-405?

It is owned by the State Highway Agency.