US Bridges

164th ST SW over SR 525

Fair

Snohomish County, Washington · 1.4 N JCT I-5 · Structure no. 0011627A0000000

Built
1980
45 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
211 ft
2 main spans
Daily traffic
30,703
2012 count
Owner
State
State Highway Agency

About this bridge

164th ST SW over SR 525 is a prestressed concrete continuous stringer/multi-beam or girder carrying 164th ST SW over SR 525 in Snohomish County, Washington. It was built in 1980, so it is 45 years old, younger 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 30,703 vehicles a day, roughly 15% of them trucks, projected to reach 38,212 by 2033. The structure is 211 ft (64.3 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries164th ST SW
CrossesSR 525
Location1.4 N JCT I-5
RouteCounty Highway 0
CountySnohomish County
StateWashington
Coordinates47.85, -122.27481
Functional classUrban Local

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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length211 ft (64.3 m)
Longest span120 ft (36.6 m)
Deck width58 ft (17.7 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,703 (2012)
Projected traffic38,212 by 2033
Trucks15%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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$5.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 164th ST SW over SR 525 built?

It was built in 1980, making it 45 years old in 2025.

What condition is 164th ST SW over SR 525 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 October 2023.

How much traffic does 164th ST SW over SR 525 carry?

About 30,703 vehicles per day (2012 count), of which roughly 15% are trucks.

How long is 164th ST SW over SR 525?

The structure is 211 ft (64.3 m) long with a longest span of 120 ft (36.6 m) and a deck 58 ft wide.

Who owns 164th ST SW over SR 525?

It is owned by the State Highway Agency.