US Bridges

148th Ave NE over Hillside Slope

Fair

King County, Washington · 0.1 MI N of JCT SR-908 · Structure no. 085762000000000

Built
1991
34 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
505 ft
6 main spans
Daily traffic
18,000
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

148th Ave NE over Hillside Slope is a prestressed concrete continuous stringer/multi-beam or girder carrying 148th Ave NE over Hillside Slope in King County, Washington. It was built in 1991, so it is 34 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 18,000 vehicles a day, roughly 5% of them trucks, projected to reach 21,100 by 2043. The structure is 505 ft (153.9 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries148th Ave NE
CrossesHillside Slope
Location0.1 MI N of JCT SR-908
RouteCity Street 1065
CountyKing County
StateWashington
Coordinates47.67633, -122.14369
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length505 ft (153.9 m)
Longest span90 ft (27.4 m)
Deck width63 ft (19.1 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,000 (2019)
Projected traffic21,100 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$12.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 148th Ave NE over Hillside Slope built?

It was built in 1991, making it 34 years old in 2025.

What condition is 148th Ave NE over Hillside Slope 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 May 2023.

How much traffic does 148th Ave NE over Hillside Slope carry?

About 18,000 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is 148th Ave NE over Hillside Slope?

The structure is 505 ft (153.9 m) long with a longest span of 90 ft (27.4 m) and a deck 63 ft wide.

Who owns 148th Ave NE over Hillside Slope?

It is owned by the City or Municipal Highway Agency.