US Bridges

Northup Way over Eastside Rail Corridor

Fair

King County, Washington · Northup & 116th · Structure no. 085689000000000

Built
1987
38 years old, rebuilt 2017
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
63 ft
1 main span
Daily traffic
14,250
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Northup Way over Eastside Rail Corridor is a prestressed concrete stringer/multi-beam or girder carrying Northup Way over Eastside Rail Corridor in King County, Washington. It was built in 1987 and reconstructed in 2017, so it is 38 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 14,250 vehicles a day, roughly 6% of them trucks, projected to reach 17,813 by 2042. The structure is 63 ft (19.2 m) long and 56 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNorthup Way
CrossesEastside Rail Corridor
LocationNorthup & 116th
RouteCity Street 75
Coordinates47.63289, -122.1849
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum 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 rating57.5 US tons
Inventory rating34.3 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20 + Mod
Structure length63 ft (19.2 m)
Longest span53 ft (16.1 m)
Deck width56 ft (17.2 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,250 (2022)
Projected traffic17,813 by 2042
Trucks6%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesPedestrian / bicycle
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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Northup Way over Eastside Rail Corridor built?

It was built in 1987, making it 38 years old in 2025. It was reconstructed in 2017.

What condition is Northup Way over Eastside Rail Corridor 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 2024.

How much traffic does Northup Way over Eastside Rail Corridor carry?

About 14,250 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Northup Way over Eastside Rail Corridor?

The structure is 63 ft (19.2 m) long with a longest span of 53 ft (16.1 m) and a deck 56 ft wide.

Who owns Northup Way over Eastside Rail Corridor?

It is owned by the City or Municipal Highway Agency.