US Bridges

12th ST NE over I-5

Fair

Snohomish County, Washington · 2.4 N JCT US 2 · Structure no. 0008226A0000000

Built
1967
58 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
212 ft
4 main spans
Daily traffic
1,250
2020 count
Owner
State
State Highway Agency

About this bridge

12th ST NE over I-5 is a prestressed concrete stringer/multi-beam or girder carrying 12th ST NE over I-5 in Snohomish County, Washington. It was built in 1967, so it is 58 years old, older 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 1,250 vehicles a day, roughly 10% of them trucks, projected to reach 1,556 by 2040. The structure is 212 ft (64.6 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries12th ST NE
CrossesI-5
Location2.4 N JCT US 2
RouteCounty Highway 0
CountySnohomish County
StateWashington
Coordinates48.00753, -122.17481
Functional classUrban Local

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 2024
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 alignment6: Equal to present minimum criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length212 ft (64.6 m)
Longest span59 ft (18 m)
Deck width34 ft (10.3 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,250 (2020)
Projected traffic1,556 by 2040
Trucks10%
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$3.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 12th ST NE over I-5 built?

It was built in 1967, making it 58 years old in 2025.

What condition is 12th ST NE 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 2024.

How much traffic does 12th ST NE over I-5 carry?

About 1,250 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is 12th ST NE over I-5?

The structure is 212 ft (64.6 m) long with a longest span of 59 ft (18 m) and a deck 34 ft wide.

Who owns 12th ST NE over I-5?

It is owned by the State Highway Agency.