US Bridges

NE 50th ST over I-5

Fair

King County, Washington · 1.6 N JCT SR 520 · Structure no. 0006111B0000000

Built
1962
63 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
241 ft
3 main spans
Daily traffic
27,000
2020 count
Owner
State
State Highway Agency

About this bridge

NE 50th ST over I-5 is a concrete continuous box beam or girders - multiple carrying NE 50th ST over I-5 in King County, Washington. It was built in 1962, so it is 63 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 27,000 vehicles a day, roughly 5% of them trucks, projected to reach 38,000 by 2036. The structure is 241 ft (73.5 m) long and 80 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNE 50th ST
CrossesI-5
Location1.6 N JCT SR 520
RouteCity Street 0
CountyKing County
StateWashington
Coordinates47.66497, -122.32253
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.2 US tons
Inventory rating17.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length241 ft (73.5 m)
Longest span101 ft (30.8 m)
Deck width80 ft (24.4 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,000 (2020)
Projected traffic38,000 by 2036
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NE 50th ST over I-5 built?

It was built in 1962, making it 63 years old in 2025.

What condition is NE 50th ST over I-5 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 2023.

How much traffic does NE 50th ST over I-5 carry?

About 27,000 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is NE 50th ST over I-5?

The structure is 241 ft (73.5 m) long with a longest span of 101 ft (30.8 m) and a deck 80 ft wide.

Who owns NE 50th ST over I-5?

It is owned by the State Highway Agency.