US Bridges

SR 96(128th ST Sw) over I-5

Fair

Snohomish County, Washington · JCT I-5 · Structure no. 0013058A0000000

Built
1987
38 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
344 ft
2 main spans
Daily traffic
43,898
2023 count
Owner
State
State Highway Agency

About this bridge

SR 96(128th ST Sw) over I-5 is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 96(128th ST Sw) over I-5 in Snohomish County, Washington. It was built in 1987, so it is 38 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 5 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 43,898 vehicles a day, roughly 4% of them trucks, projected to reach 68,978 by 2039. The structure is 344 ft (104.9 m) long and 82 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSR 96(128th ST Sw)
CrossesI-5
LocationJCT I-5
RouteState Highway 96
CountySnohomish County
StateWashington
Coordinates47.88194, -122.23442
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length344 ft (104.9 m)
Longest span166 ft (50.7 m)
Deck width82 ft (25 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,898 (2023)
Projected traffic68,978 by 2039
Trucks4%
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$13.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 96(128th ST Sw) over I-5 built?

It was built in 1987, making it 38 years old in 2025.

What condition is SR 96(128th 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 October 2023.

How much traffic does SR 96(128th ST Sw) over I-5 carry?

About 43,898 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 96(128th ST Sw) over I-5?

The structure is 344 ft (104.9 m) long with a longest span of 166 ft (50.7 m) and a deck 82 ft wide.

Who owns SR 96(128th ST Sw) over I-5?

It is owned by the State Highway Agency.