US Bridges

Ross Dam Intake over Skagit River

FairClosed to traffic

King County, Washington · Ross Dam · Structure no. 087469000000000

Built
1940
85 years old
Condition
Fair
inspected August 2022
Type
Girder and Floorbeam System
Concrete
Length
97 ft
8 main spans
Daily traffic
—
2022 count
Owner
Local
Other Local Agency

About this bridge

Ross Dam Intake over Skagit River is a concrete girder and floorbeam system carrying Ross Dam Intake over Skagit River in King County, Washington. It was built in 1940, so it is 85 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. Its operating status is: closed to all traffic.

No traffic count is recorded. The structure is 97 ft (29.6 m) long and 10 ft wide.

Location

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CarriesRoss Dam Intake
CrossesSkagit River
LocationRoss Dam
CountyKing County
StateWashington
Coordinates48.73271, -121.07012
Functional classRural Local

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 inspectionAugust 2022
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourScour evaluation has not been made
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry0: Immediate repair necessary to put back in service
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadUnknown
Structure length97 ft (29.6 m)
Longest span31 ft (9.4 m)
Deck width10 ft (3 m)
Roadway width8 ft (2.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic—
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ross Dam Intake over Skagit River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Ross Dam Intake over Skagit 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 August 2022.

How much traffic does Ross Dam Intake over Skagit River carry?

No traffic count is recorded for this structure.

How long is Ross Dam Intake over Skagit River?

The structure is 97 ft (29.6 m) long with a longest span of 31 ft (9.4 m) and a deck 10 ft wide.

Who owns Ross Dam Intake over Skagit River?

It is owned by the Other Local Agency.