US Bridges

Fairview Ave N over Union Bay

Good

King County, Washington · 1241 Fairview Ave N · Structure no. 089209000000000

Built
2021
4 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
405 ft
4 main spans
Daily traffic
3,600
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Fairview Ave N over Union Bay is a concrete continuous stringer/multi-beam or girder carrying Fairview Ave N over Union Bay in King County, Washington. It was built in 2021, so it is 4 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,600 vehicles a day, roughly 5% of them trucks, projected to reach 4,000 by 2041. The structure is 405 ft (123.4 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFairview Ave N
CrossesUnion Bay
Location1241 Fairview Ave N
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.63118, -122.32777
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
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 rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length405 ft (123.4 m)
Longest span135 ft (41.1 m)
Deck width67 ft (20.5 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2022)
Projected traffic4,000 by 2041
Trucks5%
Lanes on structure3
Traffic directionTwo-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 statusNot eligible for the National Register of Historic Places
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$9.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Fairview Ave N over Union Bay built?

It was built in 2021, making it 4 years old in 2025.

What condition is Fairview Ave N over Union Bay 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 July 2023.

How much traffic does Fairview Ave N over Union Bay carry?

About 3,600 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Fairview Ave N over Union Bay?

The structure is 405 ft (123.4 m) long with a longest span of 135 ft (41.1 m) and a deck 67 ft wide.

Who owns Fairview Ave N over Union Bay?

It is owned by the City or Municipal Highway Agency.