US Bridges

Cascade River RD over N Fork Cascade R

Fair

Skagit County, Washington · 16.02 E JCT SR 20 · Structure no. 080539000000000

Built
1986
39 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
84
2021 count
Owner
County
County Highway Agency

About this bridge

Cascade River RD over N Fork Cascade R is a prestressed concrete stringer/multi-beam or girder carrying Cascade River RD over N Fork Cascade R in Skagit County, Washington. It was built in 1986, so it is 39 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 84 vehicles a day, roughly 4% of them trucks, projected to reach 102 by 2041. The structure is 71 ft (21.6 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesCascade River RD
CrossesN Fork Cascade R
Location16.02 E JCT SR 20
RouteCounty Highway 97950
Coordinates48.46439, -121.16499
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 protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating43 US tons
Inventory rating26 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span68 ft (20.7 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic84 (2021)
Projected traffic102 by 2041
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cascade River RD over N Fork Cascade R built?

It was built in 1986, making it 39 years old in 2025.

What condition is Cascade River RD over N Fork Cascade R 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 June 2024.

How much traffic does Cascade River RD over N Fork Cascade R carry?

About 84 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is Cascade River RD over N Fork Cascade R?

The structure is 71 ft (21.6 m) long with a longest span of 68 ft (20.7 m) and a deck 20 ft wide.

Who owns Cascade River RD over N Fork Cascade R?

It is owned by the County Highway Agency.