US Bridges

164th ST SW over I-5

Fair

Snohomish County, Washington · 1.3 N JCT I-405 · Structure no. 0011561A0000000

Built
1963
62 years old, rebuilt 2001
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
323 ft
4 main spans
Daily traffic
44,483
2010 count
Owner
State
State Highway Agency

About this bridge

164th ST SW over I-5 is a prestressed concrete stringer/multi-beam or girder carrying 164th ST SW over I-5 in Snohomish County, Washington. It was built in 1963 and reconstructed in 2001, so it is 62 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 44,483 vehicles a day, roughly 5% of them trucks, projected to reach 75,710 by 2036. The structure is 323 ft (98.5 m) long and 96 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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Carries164th ST SW
CrossesI-5
Location1.3 N JCT I-405
RouteCounty Highway 0
CountySnohomish County
StateWashington
Coordinates47.84983, -122.25814
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 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 rating65 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length323 ft (98.5 m)
Longest span100 ft (30.5 m)
Deck width96 ft (29.2 m)
Roadway width81 ft (24.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,483 (2010)
Projected traffic75,710 by 2036
Trucks5%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 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$12.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 164th ST SW over I-5 built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2001.

What condition is 164th ST SW over I-5 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does 164th ST SW over I-5 carry?

About 44,483 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is 164th ST SW over I-5?

The structure is 323 ft (98.5 m) long with a longest span of 100 ft (30.5 m) and a deck 96 ft wide.

Who owns 164th ST SW over I-5?

It is owned by the State Highway Agency.