US Bridges

I-5 over BNSF RR

Good

Snohomish County, Washington · 5.0 N JCT SR 528 · Structure no. 0008632B0000000

Built
1970
55 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
421 ft
3 main spans
Daily traffic
57,277
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over BNSF RR is a prestressed concrete continuous stringer/multi-beam or girder carrying I-5 over BNSF RR in Snohomish County, Washington. It was built in 1970, so it is 55 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 57,277 vehicles a day, roughly 8% of them trucks, projected to reach 84,075 by 2039. The structure is 421 ft (128.3 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-5
CrossesBNSF RR
Location5.0 N JCT SR 528
RouteInterstate 5
Coordinates48.12402, -122.18525
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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.7 US tons
Inventory rating19.6 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length421 ft (128.3 m)
Longest span137 ft (41.8 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic57,277 (2023)
Projected traffic84,075 by 2039
Trucks8%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over BNSF RR built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-5 over BNSF RR 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 March 2024.

How much traffic does I-5 over BNSF RR carry?

About 57,277 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is I-5 over BNSF RR?

The structure is 421 ft (128.3 m) long with a longest span of 137 ft (41.8 m) and a deck 55 ft wide.

Who owns I-5 over BNSF RR?

It is owned by the State Highway Agency.