US Bridges

So Skagit Hwy. over Day Creek

Fair

Skagit County, Washington · 9.0 E JCT SR 9 · Structure no. 083851000000000

Built
1961
64 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
160 ft
3 main spans
Daily traffic
825
2021 count
Owner
County
County Highway Agency

About this bridge

So Skagit Hwy. over Day Creek is a prestressed concrete stringer/multi-beam or girder carrying So Skagit Hwy. over Day Creek in Skagit County, Washington. It was built in 1961, so it is 64 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.

It carries about 825 vehicles a day, roughly 11% of them trucks, projected to reach 1,226 by 2041. The structure is 160 ft (48.8 m) long and 26 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

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CarriesSo Skagit Hwy.
CrossesDay Creek
Location9.0 E JCT SR 9
RouteCounty Highway 7000
CountySkagit County
StateWashington
Coordinates48.50164, -122.04672
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating23.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span80 ft (24.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic825 (2021)
Projected traffic1,226 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was So Skagit Hwy. over Day Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is So Skagit Hwy. over Day 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 July 2024.

How much traffic does So Skagit Hwy. over Day Creek carry?

About 825 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is So Skagit Hwy. over Day Creek?

The structure is 160 ft (48.8 m) long with a longest span of 80 ft (24.4 m) and a deck 26 ft wide.

Who owns So Skagit Hwy. over Day Creek?

It is owned by the County Highway Agency.