US Bridges

SR 527 over I-5

Fair

Snohomish County, Washington · JCT I-5 & SR 526 · Structure no. 0013048A0000000

Built
1987
38 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
415 ft
5 main spans
Daily traffic
39,282
2023 count
Owner
State
State Highway Agency

About this bridge

SR 527 over I-5 is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 527 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 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 39,282 vehicles a day, roughly 3% of them trucks, projected to reach 57,712 by 2039. The structure is 415 ft (126.5 m) long and 88 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 527
CrossesI-5
LocationJCT I-5 & SR 526
RouteState Highway 527
CountySnohomish County
StateWashington
Coordinates47.91807, -122.20626
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 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.3 US tons
Inventory rating23.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length415 ft (126.5 m)
Longest span100 ft (30.5 m)
Deck width88 ft (26.8 m)
Roadway width85 ft (25.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic39,282 (2023)
Projected traffic57,712 by 2039
Trucks3%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$17.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 527 over I-5 built?

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

What condition is SR 527 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 527 over I-5 carry?

About 39,282 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SR 527 over I-5?

The structure is 415 ft (126.5 m) long with a longest span of 100 ft (30.5 m) and a deck 88 ft wide.

Who owns SR 527 over I-5?

It is owned by the State Highway Agency.