US Bridges

SR 520 over Yarrow Creek

Good

King County, Washington · 5.1 E JCT SR 513 · Structure no. 0017963V0000000

Built
2014
11 years old
Condition
Good
inspected August 2024
Type
Culvert
Prestressed Concrete
Length
21 ft
1 main span
Daily traffic
26,760
2023 count
Owner
State
State Highway Agency

About this bridge

SR 520 over Yarrow Creek is a prestressed concrete culvert carrying SR 520 over Yarrow Creek in King County, Washington. It was built in 2014, so it is 11 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 26,760 vehicles a day, roughly 3% of them trucks, projected to reach 48,372 by 2039. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 520
CrossesYarrow Creek
Location5.1 E JCT SR 513
RouteState Highway 520
CountyKing County
StateWashington
Coordinates47.64208, -122.2
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating44 US tons

Structure

Structure typeCulvert
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,760 (2023)
Projected traffic48,372 by 2039
Trucks3%
Lanes on structure9
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$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 520 over Yarrow Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is SR 520 over Yarrow 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 August 2024.

How much traffic does SR 520 over Yarrow Creek carry?

About 26,760 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SR 520 over Yarrow Creek?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m).

Who owns SR 520 over Yarrow Creek?

It is owned by the State Highway Agency.