US Bridges

SR 18 over SR 169 Maxwell Taylor CR

Good

King County, Washington · JCT SR 169 · Structure no. 0016611C0000000

Built
2005
20 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
521 ft
5 main spans
Daily traffic
16,971
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 over SR 169 Maxwell Taylor CR is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 18 over SR 169 Maxwell Taylor CR in King County, Washington. It was built in 2005, so it is 20 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 16,971 vehicles a day, roughly 14% of them trucks, projected to reach 24,962 by 2039. The structure is 521 ft (158.8 m) long and 43 ft wide.

CarriesSR 18
CrossesSR 169 Maxwell Taylor CR
LocationJCT SR 169
RouteState Highway 18
Coordinates47.40819, -122.03861
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating61 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length521 ft (158.8 m)
Longest span120 ft (36.6 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,971 (2023)
Projected traffic24,962 by 2039
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
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$10.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 18 over SR 169 Maxwell Taylor CR built?

It was built in 2005, making it 20 years old in 2025.

What condition is SR 18 over SR 169 Maxwell Taylor CR 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 February 2023.

How much traffic does SR 18 over SR 169 Maxwell Taylor CR carry?

About 16,971 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is SR 18 over SR 169 Maxwell Taylor CR?

The structure is 521 ft (158.8 m) long with a longest span of 120 ft (36.6 m) and a deck 43 ft wide.

Who owns SR 18 over SR 169 Maxwell Taylor CR?

It is owned by the State Highway Agency.