US Bridges

Avondale Road over Bear Creek

Fair

King County, Washington · 4.3 MI E of SR-405 · Structure no. 086186000000000

Built
1995
30 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
24,768
2019 count
Owner
County
County Highway Agency

About this bridge

Avondale Road over Bear Creek is a prestressed concrete stringer/multi-beam or girder carrying Avondale Road over Bear Creek in King County, Washington. It was built in 1995, so it is 30 years old, younger 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 24,768 vehicles a day, roughly 2% of them trucks, projected to reach 26,000 by 2040. The structure is 67 ft (20.4 m) long and 84 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesAvondale Road
CrossesBear Creek
Location4.3 MI E of SR-405
RouteCounty Highway 96809
CountyKing County
StateWashington
Coordinates47.70756, -122.09014
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 protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length67 ft (20.4 m)
Longest span65 ft (19.8 m)
Deck width84 ft (25.6 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,768 (2019)
Projected traffic26,000 by 2040
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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$5.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Avondale Road over Bear Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is Avondale Road over Bear Creek 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 August 2024.

How much traffic does Avondale Road over Bear Creek carry?

About 24,768 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Avondale Road over Bear Creek?

The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 84 ft wide.

Who owns Avondale Road over Bear Creek?

It is owned by the County Highway Agency.