US Bridges

436th Ave SE over S Fk Snoqualmie

Fair

King County, Washington · 0.8 MI S of I-90 · Structure no. 082972000000000

Built
1971
54 years old
Condition
Fair
inspected June 2024
Type
Girder and Floorbeam System
Concrete
Length
267 ft
3 main spans
Daily traffic
7,491
2019 count
Owner
County
County Highway Agency

About this bridge

436th Ave SE over S Fk Snoqualmie is a concrete girder and floorbeam system carrying 436th Ave SE over S Fk Snoqualmie in King County, Washington. It was built in 1971, so it is 54 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 7,491 vehicles a day, roughly 5% of them trucks, projected to reach 13,500 by 2039. The structure is 267 ft (81.4 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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Carries436th Ave SE
CrossesS Fk Snoqualmie
Location0.8 MI S of I-90
RouteCounty Highway 6730
CountyKing County
StateWashington
Coordinates47.46574, -121.75897
Functional classUrban Collector

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 protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.3 US tons
Inventory rating20 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length267 ft (81.4 m)
Longest span110 ft (33.5 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,491 (2019)
Projected traffic13,500 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$3.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 436th Ave SE over S Fk Snoqualmie built?

It was built in 1971, making it 54 years old in 2025.

What condition is 436th Ave SE over S Fk Snoqualmie 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 June 2024.

How much traffic does 436th Ave SE over S Fk Snoqualmie carry?

About 7,491 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is 436th Ave SE over S Fk Snoqualmie?

The structure is 267 ft (81.4 m) long with a longest span of 110 ft (33.5 m) and a deck 33 ft wide.

Who owns 436th Ave SE over S Fk Snoqualmie?

It is owned by the County Highway Agency.