US Bridges

SR 525 over SR 99

Good

Snohomish County, Washington · 2.7 N JCT I-5 · Structure no. 0015688A0000000

Built
2001
24 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
218 ft
2 main spans
Daily traffic
58,122
2023 count
Owner
State
State Highway Agency

About this bridge

SR 525 over SR 99 is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 525 over SR 99 in Snohomish County, Washington. It was built in 2001, so it is 24 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 58,122 vehicles a day, roughly 4% of them trucks, projected to reach 85,390 by 2039. The structure is 218 ft (66.4 m) long and 125 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 525
CrossesSR 99
Location2.7 N JCT I-5
RouteState Highway 525
CountySnohomish County
StateWashington
Coordinates47.86899, -122.27717
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length218 ft (66.4 m)
Longest span114 ft (34.7 m)
Deck width125 ft (38.1 m)
Roadway width119 ft (36.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic58,122 (2023)
Projected traffic85,390 by 2039
Trucks4%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
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$12.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 525 over SR 99 built?

It was built in 2001, making it 24 years old in 2025.

What condition is SR 525 over SR 99 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 August 2023.

How much traffic does SR 525 over SR 99 carry?

About 58,122 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 525 over SR 99?

The structure is 218 ft (66.4 m) long with a longest span of 114 ft (34.7 m) and a deck 125 ft wide.

Who owns SR 525 over SR 99?

It is owned by the State Highway Agency.