US Bridges

SR 530 over Montague Creek

Fair

Snohomish County, Washington · 14.2 E JCT SR 9 · Structure no. 0008389A0000000

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
106 ft
3 main spans
Daily traffic
3,586
2023 count
Owner
State
State Highway Agency

About this bridge

SR 530 over Montague Creek is a concrete continuous slab carrying SR 530 over Montague Creek in Snohomish County, Washington. It was built in 1968, so it is 57 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,586 vehicles a day, roughly 14% of them trucks, projected to reach 5,092 by 2039. The structure is 106 ft (32.3 m) long and 37 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 530
CrossesMontague Creek
Location14.2 E JCT SR 9
RouteState Highway 530
CountySnohomish County
StateWashington
Coordinates48.26919, -121.88103
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating82 US tons
Inventory rating48.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length106 ft (32.3 m)
Longest span42 ft (12.8 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,586 (2023)
Projected traffic5,092 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$2.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 530 over Montague Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is SR 530 over Montague Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does SR 530 over Montague Creek carry?

About 3,586 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is SR 530 over Montague Creek?

The structure is 106 ft (32.3 m) long with a longest span of 42 ft (12.8 m) and a deck 37 ft wide.

Who owns SR 530 over Montague Creek?

It is owned by the State Highway Agency.