US Bridges

SR 530 over Deer Creek

Good

Snohomish County, Washington · 11.6 E JCT SR 9 · Structure no. 0009119A0000000

Built
1972
53 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
210 ft
2 main spans
Daily traffic
4,618
2023 count
Owner
State
State Highway Agency

About this bridge

SR 530 over Deer Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 530 over Deer Creek in Snohomish County, Washington. It was built in 1972, so it is 53 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 4,618 vehicles a day, roughly 11% of them trucks, projected to reach 6,557 by 2039. The structure is 210 ft (64 m) long and 39 ft wide. If it were closed, the detour would be 42.9 mi (69 km).

CarriesSR 530
CrossesDeer Creek
Location11.6 E JCT SR 9
RouteState Highway 530
Coordinates48.27036, -121.934
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 rating84 US tons
Inventory rating50 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length210 ft (64 m)
Longest span103 ft (31.4 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,618 (2023)
Projected traffic6,557 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.9 mi (69 km)
TollOn a free road
National Highway SystemNo

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$3.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 530 over Deer Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is SR 530 over Deer 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 April 2023.

How much traffic does SR 530 over Deer Creek carry?

About 4,618 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 530 over Deer Creek?

The structure is 210 ft (64 m) long with a longest span of 103 ft (31.4 m) and a deck 39 ft wide.

Who owns SR 530 over Deer Creek?

It is owned by the State Highway Agency.