US Bridges

SR 9 over Samish River

Fair

Skagit County, Washington · 6.4 N JCT SR 20 · Structure no. 0003349B0000000

Built
1947
78 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
101 ft
3 main spans
Daily traffic
3,684
2023 count
Owner
State
State Highway Agency

About this bridge

SR 9 over Samish River is a concrete continuous tee beam carrying SR 9 over Samish River in Skagit County, Washington. It was built in 1947, so it is 78 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 3,684 vehicles a day, roughly 12% of them trucks, projected to reach 5,383 by 2039. The structure is 101 ft (30.8 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 9
CrossesSamish River
Location6.4 N JCT SR 20
RouteState Highway 9
CountySkagit County
StateWashington
Coordinates48.60176, -122.23277
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length101 ft (30.8 m)
Longest span60 ft (18.3 m)
Deck width32 ft (9.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,684 (2023)
Projected traffic5,383 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 9 over Samish River built?

It was built in 1947, making it 78 years old in 2025.

What condition is SR 9 over Samish River 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 April 2023.

How much traffic does SR 9 over Samish River carry?

About 3,684 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is SR 9 over Samish River?

The structure is 101 ft (30.8 m) long with a longest span of 60 ft (18.3 m) and a deck 32 ft wide.

Who owns SR 9 over Samish River?

It is owned by the State Highway Agency.