US Bridges

E-N Ramp over City Street Nprr

FairPosted for load

King County, Washington · 2.4 N JCT SR 509 · Structure no. 0006054A0000000

Built
1959
66 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
1,114 ft
12 main spans
Daily traffic
10,336
2022 count
Owner
State
State Highway Agency

About this bridge

E-N Ramp over City Street Nprr is a concrete continuous tee beam carrying E-N Ramp over City Street Nprr in King County, Washington. It was built in 1959, so it is 66 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. Its operating status is: posted for load restriction.

It carries about 10,336 vehicles a day, roughly 5% of them trucks, projected to reach 19,468 by 2039. The structure is 1,114 ft (339.5 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesE-N Ramp
CrossesCity Street Nprr
Location2.4 N JCT SR 509
RouteState Highway 99
Coordinates47.57141, -122.33904
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating21.1 US tons
Inventory rating16.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans12 (+6 approach)
Design loadHS 20
Structure length1,114 ft (339.5 m)
Longest span80 ft (24.4 m)
Deck width26 ft (8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,336 (2022)
Projected traffic19,468 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$19 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was E-N Ramp over City Street Nprr built?

It was built in 1959, making it 66 years old in 2025.

What condition is E-N Ramp over City Street Nprr 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 August 2024.

How much traffic does E-N Ramp over City Street Nprr carry?

About 10,336 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is E-N Ramp over City Street Nprr?

The structure is 1,114 ft (339.5 m) long with a longest span of 80 ft (24.4 m) and a deck 26 ft wide.

Who owns E-N Ramp over City Street Nprr?

It is owned by the State Highway Agency.