US Bridges

SR 530 over Sauk River

FairPosted for load

Skagit County, Washington · 3.5 N Snohomish CO · Structure no. 0006038A0000000

Built
1958
67 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
501 ft
1 main span
Daily traffic
1,475
2023 count
Owner
State
State Highway Agency

About this bridge

SR 530 over Sauk River is a steel truss - thru carrying SR 530 over Sauk River in Skagit County, Washington. It was built in 1958, so it is 67 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 1,475 vehicles a day, roughly 11% of them trucks, projected to reach 2,129 by 2039. The structure is 501 ft (152.7 m) long and 26 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesSR 530
CrossesSauk River
Location3.5 N Snohomish CO
RouteState Highway 530
CountySkagit County
StateWashington
Coordinates48.34467, -121.54892
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckOpen grating
Main spans1 (+4 approach)
Design loadHS 20
Structure length501 ft (152.7 m)
Longest span220 ft (67.1 m)
Deck width26 ft (7.8 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deck17 ft (5.3 m)

Traffic and service

Average daily traffic1,475 (2023)
Projected traffic2,129 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$7.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 530 over Sauk River built?

It was built in 1958, making it 67 years old in 2025.

What condition is SR 530 over Sauk River 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 June 2024.

How much traffic does SR 530 over Sauk River carry?

About 1,475 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 530 over Sauk River?

The structure is 501 ft (152.7 m) long with a longest span of 220 ft (67.1 m) and a deck 26 ft wide.

Who owns SR 530 over Sauk River?

It is owned by the State Highway Agency.