US Bridges

SR 203 over Skykomish River

Poor

Snohomish County, Washington · 5.2 N King CO · Structure no. 0005294B0000000

Built
1957
68 years old
Condition
Poor
inspected March 2024
Type
Truss - Thru
Steel
Length
582 ft
1 main span
Daily traffic
15,153
2023 count
Owner
State
State Highway Agency

About this bridge

SR 203 over Skykomish River is a steel truss - thru carrying SR 203 over Skykomish River in Snohomish County, Washington. It was built in 1957, so it is 68 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 15,153 vehicles a day, roughly 9% of them trucks, projected to reach 20,996 by 2039. The structure is 582 ft (177.4 m) long and 34 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesSR 203
CrossesSkykomish River
Location5.2 N King CO
RouteState Highway 203
CountySnohomish County
StateWashington
Coordinates47.84538, -121.97037
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 rating62.9 US tons
Inventory rating38 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadHS 20
Structure length582 ft (177.4 m)
Longest span340 ft (103.6 m)
Deck width34 ft (10.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic15,153 (2023)
Projected traffic20,996 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemYes

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$11.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 203 over Skykomish River built?

It was built in 1957, making it 68 years old in 2025.

What condition is SR 203 over Skykomish River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does SR 203 over Skykomish River carry?

About 15,153 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 203 over Skykomish River?

The structure is 582 ft (177.4 m) long with a longest span of 340 ft (103.6 m) and a deck 34 ft wide.

Who owns SR 203 over Skykomish River?

It is owned by the State Highway Agency.