US Bridges

Cascade River RD over Skagit River

FairPosted for load

Skagit County, Washington · 0.03 E JCT SR 20 · Structure no. 082288000000000

Built
1930
95 years old
Condition
Fair
inspected March 2024
Type
Truss - Thru
Steel
Length
662 ft
3 main spans
Daily traffic
608
2020 count
Owner
County
County Highway Agency

About this bridge

Cascade River RD over Skagit River is a steel truss - thru carrying Cascade River RD over Skagit River in Skagit County, Washington. It was built in 1930, so it is 95 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 5 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: posted for other load-capacity restriction.

It carries about 608 vehicles a day, roughly 11% of them trucks, projected to reach 742 by 2040. The structure is 662 ft (201.8 m) long and 22 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesCascade River RD
CrossesSkagit River
Location0.03 E JCT SR 20
RouteCounty Highway 97950
CountySkagit County
StateWashington
Coordinates48.52667, -121.43
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating12 US tons
Inventory rating8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadH 15
Structure length662 ft (201.8 m)
Longest span280 ft (85.3 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic608 (2020)
Projected traffic742 by 2040
Trucks11%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$16.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cascade River RD over Skagit River built?

It was built in 1930, making it 95 years old in 2025.

What condition is Cascade River RD 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 March 2024.

How much traffic does Cascade River RD over Skagit River carry?

About 608 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is Cascade River RD over Skagit River?

The structure is 662 ft (201.8 m) long with a longest span of 280 ft (85.3 m) and a deck 22 ft wide.

Who owns Cascade River RD over Skagit River?

It is owned by the County Highway Agency.