US Bridges

Avondale Road NE over Cottage Lake Creek

Fair

King County, Washington · 1.8 MI E of SR-202 · Structure no. 086333000000000

Built
1994
31 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
37 ft
1 main span
Daily traffic
25,321
2023 count
Owner
County
County Highway Agency

About this bridge

Avondale Road NE over Cottage Lake Creek is a concrete slab carrying Avondale Road NE over Cottage Lake Creek in King County, Washington. It was built in 1994, so it is 31 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 25,321 vehicles a day, roughly 6% of them trucks, projected to reach 45,735 by 2043. The structure is 37 ft (11.4 m) long and 84 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesAvondale Road NE
CrossesCottage Lake Creek
Location1.8 MI E of SR-202
RouteCounty Highway 96809
CountyKing County
StateWashington
Coordinates47.71667, -122.08828
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating106.8 US tons
Inventory rating90.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length37 ft (11.4 m)
Longest span37 ft (11.4 m)
Deck width84 ft (25.6 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,321 (2023)
Projected traffic45,735 by 2043
Trucks6%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$3.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Avondale Road NE over Cottage Lake Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Avondale Road NE over Cottage Lake 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 2023.

How much traffic does Avondale Road NE over Cottage Lake Creek carry?

About 25,321 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Avondale Road NE over Cottage Lake Creek?

The structure is 37 ft (11.4 m) long with a longest span of 37 ft (11.4 m) and a deck 84 ft wide.

Who owns Avondale Road NE over Cottage Lake Creek?

It is owned by the County Highway Agency.