US Bridges

23rd ST over I-5 W-N Ramp

Good

Snohomish County, Washington · 0.6 N JCT US 2 · Structure no. 0008085F0000000

Built
1967
58 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
170 ft
2 main spans
Daily traffic
2,123
2020 count
Owner
State
State Highway Agency

About this bridge

23rd ST over I-5 W-N Ramp is a prestressed concrete continuous stringer/multi-beam or girder carrying 23rd ST over I-5 W-N Ramp 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 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 2,123 vehicles a day, roughly 5% of them trucks, projected to reach 3,412 by 2040. The structure is 170 ft (51.8 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries23rd ST
CrossesI-5 W-N Ramp
Location0.6 N JCT US 2
RouteCity Street 0
Coordinates47.98689, -122.18342
Functional classUrban Collector

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 inspectionJune 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating39 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length170 ft (51.8 m)
Longest span83 ft (25.3 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,123 (2020)
Projected traffic3,412 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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$3.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 23rd ST over I-5 W-N Ramp built?

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

What condition is 23rd ST over I-5 W-N Ramp 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 June 2024.

How much traffic does 23rd ST over I-5 W-N Ramp carry?

About 2,123 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 23rd ST over I-5 W-N Ramp?

The structure is 170 ft (51.8 m) long with a longest span of 83 ft (25.3 m) and a deck 52 ft wide.

Who owns 23rd ST over I-5 W-N Ramp?

It is owned by the State Highway Agency.