US Bridges

SR 518 EB Off Ramp over 8th Ave

Good

King County, Washington · 0.2 E JCT SR 509 · Structure no. 0019078A0000000

Built
2018
7 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
176 ft
3 main spans
Daily traffic
5,000
2016 count
Owner
State
State Highway Agency

About this bridge

SR 518 EB Off Ramp over 8th Ave is a concrete stringer/multi-beam or girder carrying SR 518 EB Off Ramp over 8th Ave in King County, Washington. It was built in 2018, so it is 7 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 5,000 vehicles a day, roughly 4% of them trucks, projected to reach 6,200 by 2036. The structure is 176 ft (53.6 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 518 EB Off Ramp
Crosses8th Ave
Location0.2 E JCT SR 509
RouteState Highway 518
CountyKing County
StateWashington
Coordinates47.46978, -122.32378
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionDecember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHL 93
Structure length176 ft (53.6 m)
Longest span69 ft (21 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2016)
Projected traffic6,200 by 2036
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$6.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 518 EB Off Ramp over 8th Ave built?

It was built in 2018, making it 7 years old in 2025.

What condition is SR 518 EB Off Ramp over 8th Ave 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 December 2024.

How much traffic does SR 518 EB Off Ramp over 8th Ave carry?

About 5,000 vehicles per day (2016 count), of which roughly 4% are trucks.

How long is SR 518 EB Off Ramp over 8th Ave?

The structure is 176 ft (53.6 m) long with a longest span of 69 ft (21 m) and a deck 42 ft wide.

Who owns SR 518 EB Off Ramp over 8th Ave?

It is owned by the State Highway Agency.