US Bridges

SR 18 over Taylor Creek

Good

King County, Washington · 1.4 E JCT SR 169 · Structure no. 0016611L0000000

Built
2006
19 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
144 ft
1 main span
Daily traffic
16,971
2023 count
Owner
State
State Highway Agency

About this bridge

SR 18 over Taylor Creek is a prestressed concrete stringer/multi-beam or girder carrying SR 18 over Taylor Creek in King County, Washington. It was built in 2006, so it is 19 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 144 ft (43.9 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 18
CrossesTaylor Creek
Location1.4 E JCT SR 169
RouteState Highway 18
Coordinates47.41707, -122.01205
Functional classRural Principal Arterial - Other

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 protection8 Very GoodNo problems noted.
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 rating61.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length144 ft (43.9 m)
Longest span144 ft (43.9 m)
Deck width42 ft (12.7 m)
Roadway width39 ft (11.9 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
CrossesWaterway
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$2.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 18 over Taylor Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is SR 18 over Taylor Creek 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 Taylor Creek carry?

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

How long is SR 18 over Taylor Creek?

The structure is 144 ft (43.9 m) long with a longest span of 144 ft (43.9 m) and a deck 42 ft wide.

Who owns SR 18 over Taylor Creek?

It is owned by the State Highway Agency.