US Bridges

SR 203 over Overflow Sl

Fair

Snohomish County, Washington · 2.9 N King CO · Structure no. 0004825A0000000

Built
1954
71 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
82 ft
4 main spans
Daily traffic
12,132
2023 count
Owner
State
State Highway Agency

About this bridge

SR 203 over Overflow Sl is a concrete continuous slab carrying SR 203 over Overflow Sl in Snohomish County, Washington. It was built in 1954, so it is 71 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 12,132 vehicles a day, roughly 9% of them trucks, projected to reach 17,497 by 2039. The structure is 82 ft (25 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSR 203
CrossesOverflow Sl
Location2.9 N King CO
RouteState Highway 203
CountySnohomish County
StateWashington
Coordinates47.81426, -121.98171
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating40 US tons
Inventory rating24 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length82 ft (25 m)
Longest span22 ft (6.7 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,132 (2023)
Projected traffic17,497 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 203 over Overflow Sl built?

It was built in 1954, making it 71 years old in 2025.

What condition is SR 203 over Overflow Sl in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does SR 203 over Overflow Sl carry?

About 12,132 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 203 over Overflow Sl?

The structure is 82 ft (25 m) long with a longest span of 22 ft (6.7 m) and a deck 40 ft wide.

Who owns SR 203 over Overflow Sl?

It is owned by the State Highway Agency.