US Bridges

Issaquah F.C. Road over Old Vaughn Hill Road

Fair

King County, Washington · 0.2 MI NE of I-90 · Structure no. 079626000000000

Built
1985
40 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
37 ft
1 main span
Daily traffic
23,000
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Issaquah F.C. Road over Old Vaughn Hill Road is a concrete slab carrying Issaquah F.C. Road over Old Vaughn Hill Road in King County, Washington. It was built in 1985, so it is 40 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 5 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 23,000 vehicles a day, roughly 5% of them trucks, projected to reach 36,000 by 2041. The structure is 37 ft (11.3 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIssaquah F.C. Road
CrossesOld Vaughn Hill Road
Location0.2 MI NE of I-90
RouteCity Street 590
CountyKing County
StateWashington
Coordinates47.54569, -122.03456
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating57.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span32 ft (9.8 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,000 (2021)
Projected traffic36,000 by 2041
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Issaquah F.C. Road over Old Vaughn Hill Road built?

It was built in 1985, making it 40 years old in 2025.

What condition is Issaquah F.C. Road over Old Vaughn Hill Road 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 September 2023.

How much traffic does Issaquah F.C. Road over Old Vaughn Hill Road carry?

About 23,000 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Issaquah F.C. Road over Old Vaughn Hill Road?

The structure is 37 ft (11.3 m) long with a longest span of 32 ft (9.8 m) and a deck 60 ft wide.

Who owns Issaquah F.C. Road over Old Vaughn Hill Road?

It is owned by the City or Municipal Highway Agency.