US Bridges

Covington Way SE over SR 18

Good

King County, Washington · 7.1 E JCT SR 164 · Structure no. 0014919A0000000

Built
1997
28 years old
Condition
Good
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
328 ft
2 main spans
Daily traffic
4,000
2011 count
Owner
State
State Highway Agency

About this bridge

Covington Way SE over SR 18 is a prestressed concrete continuous box beam or girders - multiple carrying Covington Way SE over SR 18 in King County, Washington. It was built in 1997, so it is 28 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,000 vehicles a day, roughly 1% of them trucks, projected to reach 6,200 by 2036. The structure is 328 ft (100 m) long and 69 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCovington Way SE
CrossesSR 18
Location7.1 E JCT SR 164
RouteCounty Highway 0
Coordinates47.35561, -122.12365
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than 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 rating99 US tons
Inventory rating95 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length328 ft (100 m)
Longest span177 ft (53.9 m)
Deck width69 ft (21 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2011)
Projected traffic6,200 by 2036
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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$8.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Covington Way SE over SR 18 built?

It was built in 1997, making it 28 years old in 2025.

What condition is Covington Way SE over SR 18 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 March 2024.

How much traffic does Covington Way SE over SR 18 carry?

About 4,000 vehicles per day (2011 count), of which roughly 1% are trucks.

How long is Covington Way SE over SR 18?

The structure is 328 ft (100 m) long with a longest span of 177 ft (53.9 m) and a deck 69 ft wide.

Who owns Covington Way SE over SR 18?

It is owned by the State Highway Agency.