US Bridges

S 180th ST over Green River

Fair

King County, Washington · 0.1 MI W JCT SR-181 · Structure no. 085614000000000

Built
1968
57 years old, rebuilt 1995
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
190 ft
3 main spans
Daily traffic
15,698
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

S 180th ST over Green River is a steel continuous stringer/multi-beam or girder carrying S 180th ST over Green River in King County, Washington. It was built in 1968 and reconstructed in 1995, so it is 57 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 15,698 vehicles a day, roughly 19% of them trucks, projected to reach 39,000 by 2042. The structure is 190 ft (57.9 m) long and 85 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS 180th ST
CrossesGreen River
Location0.1 MI W JCT SR-181
RouteCity Street 1274
CountyKing County
StateWashington
Coordinates47.44125, -122.24664
Functional classUrban Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to 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 rating54.7 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length190 ft (57.9 m)
Longest span115 ft (35.1 m)
Deck width85 ft (25.9 m)
Roadway width71 ft (21.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,698 (2022)
Projected traffic39,000 by 2042
Trucks19%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$16.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S 180th ST over Green River built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1995.

What condition is S 180th ST 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 April 2023.

How much traffic does S 180th ST over Green River carry?

About 15,698 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is S 180th ST over Green River?

The structure is 190 ft (57.9 m) long with a longest span of 115 ft (35.1 m) and a deck 85 ft wide.

Who owns S 180th ST over Green River?

It is owned by the City or Municipal Highway Agency.