US Bridges

I-5 over Nulle RD

Good

Whatcom County, Washington · 0.2 N Skagit CO · Structure no. 0007260F0000000

Built
1964
61 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
149 ft
3 main spans
Daily traffic
23,887
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Nulle RD is a prestressed concrete stringer/multi-beam or girder carrying I-5 over Nulle RD in Whatcom County, Washington. It was built in 1964, so it is 61 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 23,887 vehicles a day, roughly 7% of them trucks, projected to reach 33,530 by 2039. The structure is 149 ft (45.4 m) long and 42 ft wide.

CarriesI-5
CrossesNulle RD
Location0.2 N Skagit CO
RouteInterstate 5
Coordinates48.64833, -122.36556
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.9 US tons
Inventory rating22.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length149 ft (45.4 m)
Longest span59 ft (18 m)
Deck width42 ft (12.7 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,887 (2023)
Projected traffic33,530 by 2039
Trucks7%
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 Nulle RD built?

It was built in 1964, making it 61 years old in 2025.

What condition is I-5 over Nulle RD 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 2024.

How much traffic does I-5 over Nulle RD carry?

About 23,887 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-5 over Nulle RD?

The structure is 149 ft (45.4 m) long with a longest span of 59 ft (18 m) and a deck 42 ft wide.

Who owns I-5 over Nulle RD?

It is owned by the State Highway Agency.