US Bridges

I-5 over Lowell Road

GoodPosted for load

Snohomish County, Washington · 2.3 N JCT SR 527 · Structure no. 0003842A0000000

Built
1950
75 years old, rebuilt 2007
Condition
Good
inspected October 2023
Type
Tee Beam
Concrete Continuous
Length
142 ft
3 main spans
Daily traffic
94,939
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Lowell Road is a concrete continuous tee beam carrying I-5 over Lowell Road in Snohomish County, Washington. It was built in 1950 and reconstructed in 2007, so it is 75 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. Its operating status is: posted for load restriction.

It carries about 94,939 vehicles a day, roughly 6% of them trucks, projected to reach 140,366 by 2039. The structure is 142 ft (43.3 m) long and 82 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-5
CrossesLowell Road
Location2.3 N JCT SR 527
RouteInterstate 5
Coordinates47.94799, -122.19837
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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19 US tons
Inventory rating14.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length142 ft (43.3 m)
Longest span56 ft (17.1 m)
Deck width82 ft (25.1 m)
Roadway width80 ft (24.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic94,939 (2023)
Projected traffic140,366 by 2039
Trucks6%
Lanes on structure5
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$5.5 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over Lowell Road built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2007.

What condition is I-5 over Lowell Road 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 2023.

How much traffic does I-5 over Lowell Road carry?

About 94,939 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is I-5 over Lowell Road?

The structure is 142 ft (43.3 m) long with a longest span of 56 ft (17.1 m) and a deck 82 ft wide.

Who owns I-5 over Lowell Road?

It is owned by the State Highway Agency.