I-5 over Kentucky ST

Good

Whatcom County, Washington · 3.2 N JCT SR 11 · Structure no. 0005642A0000000

Built: 1958; 67 years old
Condition: Good; inspected October 2024
Type: Slab; Concrete Continuous
Length: 130 ft; 3 main spans
Daily traffic: 33,565; 2023 count
Owner: State; State Highway Agency

About this bridge

I-5 over Kentucky ST is a concrete continuous slab carrying I-5 over Kentucky ST in Whatcom 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 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 33,565 vehicles a day, roughly 7% of them trucks, projected to reach 47,631 by 2039. The structure is 130 ft (39.6 m) long and 94 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-5

CrossesKentucky ST

Location3.2 N JCT SR 11

RouteInterstate 5

CountyWhatcom County

StateWashington

Coordinates48.7576, -122.46148

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.

Component	Rating	Meaning
Deck	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	7 Good	Some minor problems.

Last inspectionOctober 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourBridge not over waterway

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry9: Superior to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating28.9 US tons

Inventory rating22.5 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length130 ft (39.6 m)

Longest span51 ft (15.5 m)

Deck width94 ft (28.8 m)

Roadway width90 ft (27.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,565 (2023)

Projected traffic47,631 by 2039

Trucks7%

Lanes on structure5

Traffic directionOne-way traffic

CarriesHighway

CrossesHighway

Detour if closed1.9 mi (3 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$5.7 million (2022 estimate)

NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Kentucky ST built?

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

What condition is I-5 over Kentucky 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 October 2024.

How much traffic does I-5 over Kentucky ST carry?

About 33,565 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-5 over Kentucky ST?

The structure is 130 ft (39.6 m) long with a longest span of 51 ft (15.5 m) and a deck 94 ft wide.

Who owns I-5 over Kentucky ST?

It is owned by the State Highway Agency.