US Bridges

Parking Lot Road over Sound Transit Light Rail

Good

King County, Washington · W. of Winters House · Structure no. 089475000000000

Built
2023
2 years old
Condition
Good
inspected October 2023
Type
Slab
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
100
2023 count
Owner
Railroad
Railroad

About this bridge

Parking Lot Road over Sound Transit Light Rail is a prestressed concrete slab carrying Parking Lot Road 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 100 vehicles a day, roughly 1% of them trucks, projected to reach 120 by 2043. The structure is 31 ft (9.6 m) long and 76 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesParking Lot Road
CrossesSound Transit Light Rail
LocationW. of Winters House
RouteCity Street 75
CountyKing County
StateWashington
Coordinates47.59111, -122.19306
Functional classUrban Local

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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating46.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length31 ft (9.6 m)
Longest span30 ft (9.1 m)
Deck width76 ft (23.2 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic120 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Parking Lot Road over Sound Transit Light Rail built?

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

What condition is Parking Lot Road 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 Parking Lot Road over Sound Transit Light Rail carry?

About 100 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Parking Lot Road over Sound Transit Light Rail?

The structure is 31 ft (9.6 m) long with a longest span of 30 ft (9.1 m) and a deck 76 ft wide.

Who owns Parking Lot Road over Sound Transit Light Rail?

It is owned by the Railroad.