US Bridges

Highland Drive over North Fork Issaquah CR

Fair

King County, Washington · 0.4 MI N of NE High ST · Structure no. 087136000000000

Built
2002
23 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
22,600
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Highland Drive over North Fork Issaquah CR is a prestressed concrete stringer/multi-beam or girder carrying Highland Drive over North Fork Issaquah CR in King County, Washington. It was built in 2002, so it is 23 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 22,600 vehicles a day, roughly 5% of them trucks, projected to reach 29,700 by 2042. The structure is 110 ft (33.5 m) long and 72 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesHighland Drive
CrossesNorth Fork Issaquah CR
Location0.4 MI N of NE High ST
RouteCity Street 590
Coordinates47.54947, -122.02261
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating72.5 US tons
Inventory rating38.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span101 ft (30.8 m)
Deck width72 ft (21.9 m)
Roadway width57 ft (17.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,600 (2024)
Projected traffic29,700 by 2042
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$3.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Highland Drive over North Fork Issaquah CR built?

It was built in 2002, making it 23 years old in 2025.

What condition is Highland Drive over North Fork Issaquah CR 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 October 2024.

How much traffic does Highland Drive over North Fork Issaquah CR carry?

About 22,600 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Highland Drive over North Fork Issaquah CR?

The structure is 110 ft (33.5 m) long with a longest span of 101 ft (30.8 m) and a deck 72 ft wide.

Who owns Highland Drive over North Fork Issaquah CR?

It is owned by the City or Municipal Highway Agency.