US Bridges

Central Way over Np RY

Fair

King County, Washington · 3.3 N JCT SR 520 · Structure no. 0007548A0000000

Built
1965
60 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
149 ft
3 main spans
Daily traffic
24,500
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Central Way over Np RY is a prestressed concrete stringer/multi-beam or girder carrying Central Way over Np RY in King County, Washington. It was built in 1965, so it is 60 years old, older 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 24,500 vehicles a day, roughly 5% of them trucks, projected to reach 33,000 by 2040. The structure is 149 ft (45.4 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCentral Way
CrossesNp RY
Location3.3 N JCT SR 520
RouteCity Street 625
Coordinates47.675, -122.18833
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating42.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length149 ft (45.4 m)
Longest span53 ft (16.2 m)
Deck width55 ft (16.8 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,500 (2019)
Projected traffic33,000 by 2040
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Central Way over Np RY built?

It was built in 1965, making it 60 years old in 2025.

What condition is Central Way over Np RY 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 January 2023.

How much traffic does Central Way over Np RY carry?

About 24,500 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Central Way over Np RY?

The structure is 149 ft (45.4 m) long with a longest span of 53 ft (16.2 m) and a deck 55 ft wide.

Who owns Central Way over Np RY?

It is owned by the City or Municipal Highway Agency.