US Bridges

I-5 over SR 538

Fair

Skagit County, Washington · 1.3 N JCT SR 536 · Structure no. 0004795A0000000

Built
1955
70 years old, rebuilt 1974
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete Continuous
Length
124 ft
3 main spans
Daily traffic
32,095
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over SR 538 is a concrete continuous tee beam carrying I-5 over SR 538 in Skagit County, Washington. It was built in 1955 and reconstructed in 1974, so it is 70 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 32,095 vehicles a day, roughly 10% of them trucks, projected to reach 45,533 by 2039. The structure is 124 ft (37.8 m) long and 84 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesI-5
CrossesSR 538
Location1.3 N JCT SR 536
RouteInterstate 5
Coordinates48.43572, -122.34108
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length124 ft (37.8 m)
Longest span55 ft (16.8 m)
Deck width84 ft (25.5 m)
Roadway width78 ft (23.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,095 (2023)
Projected traffic45,533 by 2039
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$4.9 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over SR 538 built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1974.

What condition is I-5 over SR 538 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 May 2024.

How much traffic does I-5 over SR 538 carry?

About 32,095 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-5 over SR 538?

The structure is 124 ft (37.8 m) long with a longest span of 55 ft (16.8 m) and a deck 84 ft wide.

Who owns I-5 over SR 538?

It is owned by the State Highway Agency.