US Bridges

SE Aub-Blk Dia RD over Green River

Fair

King County, Washington · 0.2 MI NE of SR-18 · Structure no. 081993000000000

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
243 ft
1 main span
Daily traffic
8,871
2020 count
Owner
County
County Highway Agency

About this bridge

SE Aub-Blk Dia RD over Green River is a steel stringer/multi-beam or girder carrying SE Aub-Blk Dia RD over Green River in King County, Washington. It was built in 1970, so it is 55 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 8,871 vehicles a day, roughly 2% of them trucks, projected to reach 16,020 by 2040. The structure is 243 ft (74.1 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSE Aub-Blk Dia RD
CrossesGreen River
Location0.2 MI NE of SR-18
RouteCounty Highway 93681
CountyKing County
StateWashington
Coordinates47.30167, -122.17569
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length243 ft (74.1 m)
Longest span160 ft (48.8 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,871 (2020)
Projected traffic16,020 by 2040
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE Aub-Blk Dia RD over Green River built?

It was built in 1970, making it 55 years old in 2025.

What condition is SE Aub-Blk Dia RD 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 May 2023.

How much traffic does SE Aub-Blk Dia RD over Green River carry?

About 8,871 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is SE Aub-Blk Dia RD over Green River?

The structure is 243 ft (74.1 m) long with a longest span of 160 ft (48.8 m) and a deck 33 ft wide.

Who owns SE Aub-Blk Dia RD over Green River?

It is owned by the County Highway Agency.