US Bridges

308th Ave SE over Patterson Creek

Good

King County, Washington · 0.2 MI No of SR-202 · Structure no. 087798000000000

Built
2008
17 years old
Condition
Good
inspected September 2024
Type
Slab
Prestressed Concrete
Length
33 ft
1 main span
Daily traffic
330
2024 count
Owner
County
County Highway Agency

About this bridge

308th Ave SE over Patterson Creek is a prestressed concrete slab carrying 308th Ave SE over Patterson Creek in King County, Washington. It was built in 2008, so it is 17 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 330 vehicles a day, roughly 2% of them trucks, projected to reach 440 by 2044. The structure is 33 ft (10.1 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries308th Ave SE
CrossesPatterson Creek
Location0.2 MI No of SR-202
RouteCounty Highway 67990
CountyKing County
StateWashington
Coordinates47.58083, -121.93192
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating51.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length33 ft (10.1 m)
Longest span31 ft (9.4 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic330 (2024)
Projected traffic440 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$1.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 308th Ave SE over Patterson Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is 308th Ave SE over Patterson Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does 308th Ave SE over Patterson Creek carry?

About 330 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is 308th Ave SE over Patterson Creek?

The structure is 33 ft (10.1 m) long with a longest span of 31 ft (9.4 m) and a deck 24 ft wide.

Who owns 308th Ave SE over Patterson Creek?

It is owned by the County Highway Agency.