US Bridges

Tualco Rd. over Riley Slough-Skykomish R

Good

Snohomish County, Washington · 1.4 SW JCT SR 203 · Structure no. 089158000000000

Built
2020
5 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
206 ft
3 main spans
Daily traffic
702
2022 count
Owner
County
County Highway Agency

About this bridge

Tualco Rd. over Riley Slough-Skykomish R is a prestressed concrete continuous stringer/multi-beam or girder carrying Tualco Rd. over Riley Slough-Skykomish R in Snohomish County, Washington. It was built in 2020, so it is 5 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 702 vehicles a day, roughly 17% of them trucks, projected to reach 1,500 by 2046. The structure is 206 ft (62.9 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesTualco Rd.
CrossesRiley Slough-Skykomish R
Location1.4 SW JCT SR 203
RouteCounty Highway 92555
Coordinates47.82006, -121.98638
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating43.2 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length206 ft (62.9 m)
Longest span85 ft (25.9 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic702 (2022)
Projected traffic1,500 by 2046
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$7.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Tualco Rd. over Riley Slough-Skykomish R built?

It was built in 2020, making it 5 years old in 2025.

What condition is Tualco Rd. over Riley Slough-Skykomish R 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 August 2024.

How much traffic does Tualco Rd. over Riley Slough-Skykomish R carry?

About 702 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is Tualco Rd. over Riley Slough-Skykomish R?

The structure is 206 ft (62.9 m) long with a longest span of 85 ft (25.9 m) and a deck 36 ft wide.

Who owns Tualco Rd. over Riley Slough-Skykomish R?

It is owned by the County Highway Agency.