US Bridges

148th ST SW over SR 525

Good

Snohomish County, Washington · 2.4 N JCT I-5 · Structure no. 0011627B0000000

Built
1980
45 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
220 ft
2 main spans
Daily traffic
8,494
2020 count
Owner
State
State Highway Agency

About this bridge

148th ST SW over SR 525 is a prestressed concrete continuous stringer/multi-beam or girder carrying 148th 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 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 8,494 vehicles a day, roughly 6% of them trucks, projected to reach 13,649 by 2040. The structure is 220 ft (67.1 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries148th ST SW
CrossesSR 525
Location2.4 N JCT I-5
RouteCounty Highway 0
CountySnohomish County
StateWashington
Coordinates47.86419, -122.27525
Functional classUrban Collector

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 inspectionOctober 2023
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 rating99 US tons
Inventory rating63.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length220 ft (67.1 m)
Longest span126 ft (38.3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,494 (2020)
Projected traffic13,649 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$4.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 148th ST SW over SR 525 built?

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

What condition is 148th ST SW over SR 525 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 148th ST SW over SR 525 carry?

About 8,494 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is 148th ST SW over SR 525?

The structure is 220 ft (67.1 m) long with a longest span of 126 ft (38.3 m) and a deck 43 ft wide.

Who owns 148th ST SW over SR 525?

It is owned by the State Highway Agency.