US Bridges

Sylvester Road SW over Fox Creek

Good

King County, Washington · 0.7 S SW 160th · Structure no. 088466000000000

Built
2012
13 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
225 ft
1 main span
Daily traffic
2,700
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sylvester Road SW over Fox Creek is a prestressed concrete stringer/multi-beam or girder carrying Sylvester Road SW over Fox Creek in King County, Washington. It was built in 2012, so it is 13 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 2,700 vehicles a day, roughly 5% of them trucks, projected to reach 5,000 by 2038. The structure is 225 ft (68.6 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSylvester Road SW
CrossesFox Creek
Location0.7 S SW 160th
RouteCity Street 870
CountyKing County
StateWashington
Coordinates47.4514, -122.34879
Functional classUrban Collector

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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length225 ft (68.6 m)
Longest span220 ft (67.1 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2018)
Projected traffic5,000 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$8.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sylvester Road SW over Fox Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is Sylvester Road SW over Fox 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 May 2024.

How much traffic does Sylvester Road SW over Fox Creek carry?

About 2,700 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Sylvester Road SW over Fox Creek?

The structure is 225 ft (68.6 m) long with a longest span of 220 ft (67.1 m) and a deck 32 ft wide.

Who owns Sylvester Road SW over Fox Creek?

It is owned by the City or Municipal Highway Agency.