US Bridges

120th Ave NE over Sound Transit Light Rail

Good

King County, Washington · 0.19 N NE 12th ST · Structure no. 088967000000000

Built
2017
8 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
58 ft
1 main span
Daily traffic
5,298
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

120th Ave NE over Sound Transit Light Rail is a prestressed concrete stringer/multi-beam or girder carrying 120th Ave NE over Sound Transit Light Rail in King County, Washington. It was built in 2017, so it is 8 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,298 vehicles a day, roughly 9% of them trucks, projected to reach 6,623 by 2042. The structure is 58 ft (17.7 m) long and 103 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries120th Ave NE
CrossesSound Transit Light Rail
Location0.19 N NE 12th ST
RouteCity Street 75
CountyKing County
StateWashington
Coordinates47.6235, -122.17967
Functional classUrban Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.4 US tons
Inventory rating66.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length58 ft (17.7 m)
Longest span47 ft (14.3 m)
Deck width103 ft (31.3 m)
Roadway width73 ft (22.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,298 (2022)
Projected traffic6,623 by 2042
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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$744,000 (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 120th Ave NE over Sound Transit Light Rail built?

It was built in 2017, making it 8 years old in 2025.

What condition is 120th Ave NE over Sound Transit Light Rail 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 May 2024.

How much traffic does 120th Ave NE over Sound Transit Light Rail carry?

About 5,298 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is 120th Ave NE over Sound Transit Light Rail?

The structure is 58 ft (17.7 m) long with a longest span of 47 ft (14.3 m) and a deck 103 ft wide.

Who owns 120th Ave NE over Sound Transit Light Rail?

It is owned by the City or Municipal Highway Agency.