US Bridges

112th ST SE over I-5 SB

Good

Snohomish County, Washington · 1.3 N JCT SR 96 · Structure no. 0017163A0000000

Built
2007
18 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
182 ft
2 main spans
Daily traffic
12,000
2012 count
Owner
State
State Highway Agency

About this bridge

112th ST SE over I-5 SB is a prestressed concrete stringer/multi-beam or girder carrying 112th ST SE over I-5 SB in Snohomish County, Washington. It was built in 2007, so it is 18 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 12,000 vehicles a day, roughly 5% of them trucks, projected to reach 19,488 by 2038. The structure is 182 ft (55.5 m) long and 98 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries112th ST SE
CrossesI-5 SB
Location1.3 N JCT SR 96
RouteCity Street 0
Coordinates47.89642, -122.21694
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating62.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length182 ft (55.5 m)
Longest span116 ft (35.3 m)
Deck width98 ft (29.8 m)
Roadway width81 ft (24.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,000 (2012)
Projected traffic19,488 by 2038
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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$5.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 112th ST SE over I-5 SB built?

It was built in 2007, making it 18 years old in 2025.

What condition is 112th ST SE over I-5 SB 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 February 2024.

How much traffic does 112th ST SE over I-5 SB carry?

About 12,000 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is 112th ST SE over I-5 SB?

The structure is 182 ft (55.5 m) long with a longest span of 116 ft (35.3 m) and a deck 98 ft wide.

Who owns 112th ST SE over I-5 SB?

It is owned by the State Highway Agency.