US Bridges

SR 104 over Hood Canal

Fair

Jefferson County, Washington · 13.7 E JCT US 101 · Structure no. 0016525C0000000

Built
2007
18 years old
Condition
Fair
inspected May 2024
Type
Truss - Thru
Steel
Length
489 ft
1 main span
Daily traffic
18,159
2023 count
Owner
State
State Highway Agency

About this bridge

SR 104 over Hood Canal is a steel truss - thru carrying SR 104 over Hood Canal in Jefferson County, Washington. It was built in 2007, so it is 18 years old, younger 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 18,159 vehicles a day, roughly 7% of them trucks, projected to reach 24,741 by 2039. The structure is 489 ft (149 m) long and 65 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 104
CrossesHood Canal
Location13.7 E JCT US 101
RouteState Highway 104
CountyJefferson County
StateWashington
Coordinates47.86651, -122.63628
Functional classRural Principal Arterial - Other

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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckOpen grating
Main spans1 (+3 approach)
Design loadHS 25 or greater
Structure length489 ft (149 m)
Longest span280 ft (85.3 m)
Deck width65 ft (19.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck29 ft (9 m)

Traffic and service

Average daily traffic18,159 (2023)
Projected traffic24,741 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$9.8 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SR 104 over Hood Canal built?

It was built in 2007, making it 18 years old in 2025.

What condition is SR 104 over Hood Canal 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 104 over Hood Canal carry?

About 18,159 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 104 over Hood Canal?

The structure is 489 ft (149 m) long with a longest span of 280 ft (85.3 m) and a deck 65 ft wide.

Who owns SR 104 over Hood Canal?

It is owned by the State Highway Agency.