US Bridges

I-5 over SR 548 (d St)

Good

Whatcom County, Washington · JCT SR 548 · Structure no. 0007057C0000000

Built
1963
62 years old
Condition
Good
inspected May 2023
Type
Slab
Concrete Continuous
Length
163 ft
3 main spans
Daily traffic
2,280
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over SR 548 (d St) is a concrete continuous slab carrying I-5 over SR 548 (d St) in Whatcom County, Washington. It was built in 1963, so it is 62 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 2,280 vehicles a day, roughly 1% of them trucks, projected to reach 5,084 by 2039. The structure is 163 ft (49.7 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesI-5
CrossesSR 548 (d St)
LocationJCT SR 548
RouteInterstate 5
CountyWhatcom County
StateWashington
Coordinates48.99742, -122.75203
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length163 ft (49.7 m)
Longest span73 ft (22.3 m)
Deck width35 ft (10.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,280 (2023)
Projected traffic5,084 by 2039
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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$3.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over SR 548 (d St) built?

It was built in 1963, making it 62 years old in 2025.

What condition is I-5 over SR 548 (d 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 May 2023.

How much traffic does I-5 over SR 548 (d St) carry?

About 2,280 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is I-5 over SR 548 (d St)?

The structure is 163 ft (49.7 m) long with a longest span of 73 ft (22.3 m) and a deck 35 ft wide.

Who owns I-5 over SR 548 (d St)?

It is owned by the State Highway Agency.