US Bridges

Interurban Ave S over Green River

Fair

King County, Washington · 0.1 N JCT I-405 · Structure no. 0007079A0000000

Built
1963
62 years old, rebuilt 2003
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
205 ft
3 main spans
Daily traffic
32,860
2012 count
Owner
State
State Highway Agency

About this bridge

Interurban Ave S over Green River is a prestressed concrete stringer/multi-beam or girder carrying Interurban Ave S over Green River in King County, Washington. It was built in 1963 and reconstructed in 2003, so it is 62 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 32,860 vehicles a day, roughly 8% of them trucks. The structure is 205 ft (62.5 m) long and 85 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesInterurban Ave S
CrossesGreen River
Location0.1 N JCT I-405
RouteCity Street 405
CountyKing County
StateWashington
Coordinates47.46525, -122.24764
Functional classUrban Other Principal Arterial

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length205 ft (62.5 m)
Longest span114 ft (34.7 m)
Deck width85 ft (25.9 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,860 (2012)
Projected traffic—
Trucks8%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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$7.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Interurban Ave S over Green River built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2003.

What condition is Interurban Ave S over Green River 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 July 2024.

How much traffic does Interurban Ave S over Green River carry?

About 32,860 vehicles per day (2012 count), of which roughly 8% are trucks.

How long is Interurban Ave S over Green River?

The structure is 205 ft (62.5 m) long with a longest span of 114 ft (34.7 m) and a deck 85 ft wide.

Who owns Interurban Ave S over Green River?

It is owned by the State Highway Agency.