US Bridges

SB I-5 Ramp over Detention Vault

Fair

Snohomish County, Washington · 0.4 N JCT SR 524 · Structure no. 0017945B0000000

Built
2012
13 years old
Condition
Fair
inspected August 2022
Type
Culvert
Concrete
Length
270 ft
1 main span
Daily traffic
22,206
2023 count
Owner
State
State Highway Agency

About this bridge

SB I-5 Ramp over Detention Vault is a concrete culvert carrying SB I-5 Ramp over Detention Vault in Snohomish County, Washington. It was built in 2012, so it is 13 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 22,206 vehicles a day, roughly 3% of them trucks, projected to reach 32,989 by 2039. The structure is 270 ft (82.3 m) long and 15 ft wide.

Location

Open in Google Maps
CarriesSB I-5 Ramp
CrossesDetention Vault
Location0.4 N JCT SR 524
RouteInterstate 5
CountySnohomish County
StateWashington
Coordinates47.82497, -122.27322
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length270 ft (82.3 m)
Longest span270 ft (82.3 m)
Deck width15 ft (4.7 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,206 (2023)
Projected traffic32,989 by 2039
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$5.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SB I-5 Ramp over Detention Vault built?

It was built in 2012, making it 13 years old in 2025.

What condition is SB I-5 Ramp over Detention Vault 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 August 2022.

How much traffic does SB I-5 Ramp over Detention Vault carry?

About 22,206 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SB I-5 Ramp over Detention Vault?

The structure is 270 ft (82.3 m) long with a longest span of 270 ft (82.3 m) and a deck 15 ft wide.

Who owns SB I-5 Ramp over Detention Vault?

It is owned by the State Highway Agency.