US Bridges

I-5 over N-W Ramp I-5

Good

Whatcom County, Washington · 8.2 N JCT SR 548 · Structure no. 0006926E0000000

Built
1962
63 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
245 ft
4 main spans
Daily traffic
2,244
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over N-W Ramp I-5 is a prestressed concrete stringer/multi-beam or girder carrying I-5 over N-W Ramp I-5 in Whatcom County, Washington. It was built in 1962, so it is 63 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 2,244 vehicles a day, roughly 5% of them trucks, projected to reach 3,602 by 2039. The structure is 245 ft (74.7 m) long and 25 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5
CrossesN-W Ramp I-5
Location8.2 N JCT SR 548
RouteInterstate 5
CountyWhatcom County
StateWashington
Coordinates48.97525, -122.72311
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 inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length245 ft (74.7 m)
Longest span69 ft (21 m)
Deck width25 ft (7.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,244 (2023)
Projected traffic3,602 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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$3.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over N-W Ramp I-5 built?

It was built in 1962, making it 63 years old in 2025.

What condition is I-5 over N-W Ramp I-5 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 N-W Ramp I-5 carry?

About 2,244 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is I-5 over N-W Ramp I-5?

The structure is 245 ft (74.7 m) long with a longest span of 69 ft (21 m) and a deck 25 ft wide.

Who owns I-5 over N-W Ramp I-5?

It is owned by the State Highway Agency.