US Bridges

5 TH ST - Index over N.F. Skykomish River

Good

Snohomish County, Washington · 1.0 NE JCT SR 2 · Structure no. 086422000000000

Built
1999
26 years old
Condition
Good
inspected June 2024
Type
Arch - Thru
Steel
Length
271 ft
1 main span
Daily traffic
842
2019 count
Owner
County
County Highway Agency

About this bridge

5 TH ST - Index over N.F. Skykomish River is a steel arch - thru carrying 5 TH ST - Index over N.F. Skykomish River in Snohomish County, Washington. It was built in 1999, so it is 26 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 842 vehicles a day, roughly 8% of them trucks, projected to reach 1,500 by 2042. The structure is 271 ft (82.6 m) long and 47 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
Carries5 TH ST - Index
CrossesN.F. Skykomish River
Location1.0 NE JCT SR 2
RouteCounty Highway 54670
CountySnohomish County
StateWashington
Coordinates47.81914, -121.55347
Functional classRural Local

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length271 ft (82.6 m)
Longest span262 ft (79.9 m)
Deck width47 ft (14.3 m)
Roadway width26 ft (8 m)
Vertical clearance over deck41 ft (12.4 m)

Traffic and service

Average daily traffic842 (2019)
Projected traffic1,500 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed14.9 mi (24 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 5 TH ST - Index over N.F. Skykomish River built?

It was built in 1999, making it 26 years old in 2025.

What condition is 5 TH ST - Index over N.F. Skykomish River 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 5 TH ST - Index over N.F. Skykomish River carry?

About 842 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is 5 TH ST - Index over N.F. Skykomish River?

The structure is 271 ft (82.6 m) long with a longest span of 262 ft (79.9 m) and a deck 47 ft wide.

Who owns 5 TH ST - Index over N.F. Skykomish River?

It is owned by the County Highway Agency.