US Bridges

I-5 over SR 20 BNSF RR & City ST

Good

Skagit County, Washington · 2.4 N JCT SR 538 · Structure no. 0004833A0000000

Built
1955
70 years old, rebuilt 1972
Condition
Good
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
244 ft
4 main spans
Daily traffic
37,394
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over SR 20 BNSF RR & City ST is a concrete continuous tee beam carrying I-5 over SR 20 BNSF RR & City ST in Skagit County, Washington. It was built in 1955 and reconstructed in 1972, 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 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 37,394 vehicles a day, roughly 10% of them trucks, projected to reach 56,311 by 2039. The structure is 244 ft (74.4 m) long and 118 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5
CrossesSR 20 BNSF RR & City ST
Location2.4 N JCT SR 538
RouteInterstate 5
CountySkagit County
StateWashington
Coordinates48.47047, -122.34204
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.8 US tons
Inventory rating17.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length244 ft (74.4 m)
Longest span70 ft (21.3 m)
Deck width118 ft (36.1 m)
Roadway width116 ft (35.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,394 (2023)
Projected traffic56,311 by 2039
Trucks10%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 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$13.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over SR 20 BNSF RR & City ST built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1972.

What condition is I-5 over SR 20 BNSF RR & City ST 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 March 2023.

How much traffic does I-5 over SR 20 BNSF RR & City ST carry?

About 37,394 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I-5 over SR 20 BNSF RR & City ST?

The structure is 244 ft (74.4 m) long with a longest span of 70 ft (21.3 m) and a deck 118 ft wide.

Who owns I-5 over SR 20 BNSF RR & City ST?

It is owned by the State Highway Agency.