US Bridges

179th Av SE over Pedestrian Tunnel

Good

Snohomish County, Washington · 0.1 N JCT SR2 · Structure no. 086356000000000

Built
1985
40 years old
Condition
Good
inspected March 2023
Type
Culvert
Aluminum, Wrought Iron, or Cast Iron
Length
51 ft
2 main spans
Daily traffic
3,540
2019 count
Owner
County
County Highway Agency

About this bridge

179th Av SE over Pedestrian Tunnel is a aluminum, wrought iron, or cast iron culvert carrying 179th Av SE over Pedestrian Tunnel in Snohomish County, Washington. It was built in 1985, so it is 40 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 3,540 vehicles a day, roughly 11% of them trucks, projected to reach 5,000 by 2043. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries179th Av SE
CrossesPedestrian Tunnel
Location0.1 N JCT SR2
RouteCounty Highway 45230
CountySnohomish County
StateWashington
Coordinates47.86832, -121.99075
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
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating80 US tons

Structure

Structure typeCulvert
MaterialAluminum, Wrought Iron, or Cast Iron
DeckNot applicable
Main spans2
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span22 ft (6.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,540 (2019)
Projected traffic5,000 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 179th Av SE over Pedestrian Tunnel built?

It was built in 1985, making it 40 years old in 2025.

What condition is 179th Av SE over Pedestrian Tunnel 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 March 2023.

How much traffic does 179th Av SE over Pedestrian Tunnel carry?

About 3,540 vehicles per day (2019 count), of which roughly 11% are trucks.

How long is 179th Av SE over Pedestrian Tunnel?

The structure is 51 ft (15.5 m) long with a longest span of 22 ft (6.6 m).

Who owns 179th Av SE over Pedestrian Tunnel?

It is owned by the County Highway Agency.