US Bridges

So Lk Stevens RD over So End Lake Stevens

Good

Snohomish County, Washington · 1.6 MI NE JCT SR 9 · Structure no. 086113000000000

Built
1995
30 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
414 ft
4 main spans
Daily traffic
3,700
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

So Lk Stevens RD over So End Lake Stevens is a prestressed concrete continuous stringer/multi-beam or girder carrying So Lk Stevens RD over So End Lake Stevens in Snohomish County, Washington. It was built in 1995, so it is 30 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 3,700 vehicles a day, roughly 10% of them trucks, projected to reach 7,500 by 2045. The structure is 414 ft (126.3 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSo Lk Stevens RD
CrossesSo End Lake Stevens
Location1.6 MI NE JCT SR 9
RouteCounty Highway 664
Coordinates47.98677, -122.07779
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating30 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length414 ft (126.3 m)
Longest span107 ft (32.6 m)
Deck width43 ft (13.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,700 (2023)
Projected traffic7,500 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$15.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was So Lk Stevens RD over So End Lake Stevens built?

It was built in 1995, making it 30 years old in 2025.

What condition is So Lk Stevens RD over So End Lake Stevens 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 September 2023.

How much traffic does So Lk Stevens RD over So End Lake Stevens carry?

About 3,700 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is So Lk Stevens RD over So End Lake Stevens?

The structure is 414 ft (126.3 m) long with a longest span of 107 ft (32.6 m) and a deck 43 ft wide.

Who owns So Lk Stevens RD over So End Lake Stevens?

It is owned by the City or Municipal Highway Agency.