US Bridges

NB I-5 over Inspection Lanes/Bldgs

Good

Whatcom County, Washington · 0.2 N JCT SR 548 · Structure no. 002004010000000

Built
2009
16 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
322 ft
5 main spans
Daily traffic
2,280
2023 count
Owner
State
State Highway Agency

About this bridge

NB I-5 over Inspection Lanes/Bldgs is a prestressed concrete continuous stringer/multi-beam or girder carrying NB I-5 over Inspection Lanes/Bldgs in Whatcom County, Washington. It was built in 2009, so it is 16 years old, younger 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 322 ft (98.1 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB I-5
CrossesInspection Lanes/Bldgs
Location0.2 N JCT SR 548
RouteInterstate 5
CountyWhatcom County
StateWashington
Coordinates48.99931, -122.75358
Functional classRural 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length322 ft (98.1 m)
Longest span77 ft (23.5 m)
Deck width55 ft (16.9 m)
Roadway width53 ft (16.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,280 (2023)
Projected traffic5,084 by 2039
Trucks1%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB I-5 over Inspection Lanes/Bldgs built?

It was built in 2009, making it 16 years old in 2025.

What condition is NB I-5 over Inspection Lanes/Bldgs 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 July 2023.

How much traffic does NB I-5 over Inspection Lanes/Bldgs carry?

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

How long is NB I-5 over Inspection Lanes/Bldgs?

The structure is 322 ft (98.1 m) long with a longest span of 77 ft (23.5 m) and a deck 55 ft wide.

Who owns NB I-5 over Inspection Lanes/Bldgs?

It is owned by the State Highway Agency.