US Bridges

112th Ave SE over Sound Transit Light Rail

Good

King County, Washington · 0.4 MI N of Bellevue Way · Structure no. 089477000000000

Built
2023
2 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete
Length
310 ft
1 main span
Daily traffic
500
2020 count
Owner
Railroad
Railroad

About this bridge

112th Ave SE over Sound Transit Light Rail is a concrete slab carrying 112th Ave SE over Sound Transit Light Rail in King County, Washington. It was built in 2023, so it is 2 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 500 vehicles a day, roughly 5% of them trucks, projected to reach 600 by 2043. The structure is 310 ft (94.5 m) long and 82 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries112th Ave SE
CrossesSound Transit Light Rail
Location0.4 MI N of Bellevue Way
RouteCity Street 75
CountyKing County
StateWashington
Coordinates47.59889, -122.19111
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating87.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length310 ft (94.5 m)
Longest span32 ft (9.8 m)
Deck width82 ft (25 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2020)
Projected traffic600 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerRailroad
Maintained byRailroad
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$18.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 112th Ave SE over Sound Transit Light Rail built?

It was built in 2023, making it 2 years old in 2025.

What condition is 112th Ave SE 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 October 2023.

How much traffic does 112th Ave SE over Sound Transit Light Rail carry?

About 500 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 112th Ave SE over Sound Transit Light Rail?

The structure is 310 ft (94.5 m) long with a longest span of 32 ft (9.8 m) and a deck 82 ft wide.

Who owns 112th Ave SE over Sound Transit Light Rail?

It is owned by the Railroad.