US Bridges

SR 530 over Ashton Creek

Good

Snohomish County, Washington · 24.0 E JCT SR 9 · Structure no. 0008804B0000000

Built
1970
55 years old
Condition
Good
inspected August 2022
Type
Slab
Concrete Continuous
Length
94 ft
3 main spans
Daily traffic
3,372
2023 count
Owner
State
State Highway Agency

About this bridge

SR 530 over Ashton Creek is a concrete continuous slab carrying SR 530 over Ashton Creek in Snohomish County, Washington. It was built in 1970, so it is 55 years old, older 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 3,372 vehicles a day, roughly 14% of them trucks, projected to reach 4,789 by 2039. The structure is 94 ft (28.7 m) long and 39 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSR 530
CrossesAshton Creek
Location24.0 E JCT SR 9
RouteState Highway 530
Coordinates48.26922, -121.67561
Functional classRural 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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating42 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length94 ft (28.7 m)
Longest span36 ft (11 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,372 (2023)
Projected traffic4,789 by 2039
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 530 over Ashton Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is SR 530 over Ashton 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 2022.

How much traffic does SR 530 over Ashton Creek carry?

About 3,372 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is SR 530 over Ashton Creek?

The structure is 94 ft (28.7 m) long with a longest span of 36 ft (11 m) and a deck 39 ft wide.

Who owns SR 530 over Ashton Creek?

It is owned by the State Highway Agency.