US Bridges

Lk Wash BLVD/112th over I-405

Good

King County, Washington · 3.8 N JCT SR 900 · Structure no. 0019242G0000000

Built
2024
1 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
106 ft
1 main span
Daily traffic
68,675
2022 count
Owner
State
State Highway Agency

About this bridge

Lk Wash BLVD/112th over I-405 is a prestressed concrete stringer/multi-beam or girder carrying Lk Wash BLVD/112th over I-405 in King County, Washington. It was built in 2024, so it is 1 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 68,675 vehicles a day, roughly 3% of them trucks, projected to reach 116,168 by 2043. The structure is 106 ft (32.2 m) long and 63 ft wide.

Location

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CarriesLk Wash BLVD/112th
CrossesI-405
Location3.8 N JCT SR 900
RouteCounty Highway 0
CountyKing County
StateWashington
Coordinates47.5567, -122.18947
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable 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 rating55.3 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length106 ft (32.2 m)
Longest span103 ft (31.5 m)
Deck width63 ft (19.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68,675 (2022)
Projected traffic116,168 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
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 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Lk Wash BLVD/112th over I-405 built?

It was built in 2024, making it 1 years old in 2025.

What condition is Lk Wash BLVD/112th over I-405 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 August 2024.

How much traffic does Lk Wash BLVD/112th over I-405 carry?

About 68,675 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Lk Wash BLVD/112th over I-405?

The structure is 106 ft (32.2 m) long with a longest span of 103 ft (31.5 m) and a deck 63 ft wide.

Who owns Lk Wash BLVD/112th over I-405?

It is owned by the State Highway Agency.