US Bridges

68th Ave NE over Sammamish River

Fair

King County, Washington · 0.2 MI S of SR-522 · Structure no. 089301000000000

Built
2022
3 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
590 ft
5 main spans
Daily traffic
1
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

68th Ave NE over Sammamish River is a concrete box beam or girders - multiple carrying 68th Ave NE over Sammamish River in King County, Washington. It was built in 2022, so it is 3 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 1 vehicles a day, roughly 1% of them trucks, projected to reach 10 by 2042. The structure is 590 ft (179.8 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries68th Ave NE
CrossesSammamish River
Location0.2 MI S of SR-522
RouteCity Street 609
CountyKing County
StateWashington
Coordinates47.75563, -122.24976
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length590 ft (179.8 m)
Longest span140 ft (42.7 m)
Deck width45 ft (13.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2022)
Projected traffic10 by 2042
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$21.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 68th Ave NE over Sammamish River built?

It was built in 2022, making it 3 years old in 2025.

What condition is 68th Ave NE over Sammamish 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 June 2024.

How much traffic does 68th Ave NE over Sammamish River carry?

About 1 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is 68th Ave NE over Sammamish River?

The structure is 590 ft (179.8 m) long with a longest span of 140 ft (42.7 m) and a deck 45 ft wide.

Who owns 68th Ave NE over Sammamish River?

It is owned by the City or Municipal Highway Agency.