US Bridges

SR 20 over Debris Channel

Good

Skagit County, Washington · 24.5 E JCT SR 9 · Structure no. 0015905A0000000

Built
2000
25 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
119 ft
1 main span
Daily traffic
2,998
2023 count
Owner
State
State Highway Agency

About this bridge

SR 20 over Debris Channel is a prestressed concrete stringer/multi-beam or girder carrying SR 20 over Debris Channel in Skagit County, Washington. It was built in 2000, so it is 25 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,998 vehicles a day, roughly 10% of them trucks, projected to reach 4,330 by 2040. The structure is 119 ft (36.3 m) long and 44 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 20
CrossesDebris Channel
Location24.5 E JCT SR 9
RouteState Highway 20
CountySkagit County
StateWashington
Coordinates48.53355, -121.72639
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length119 ft (36.3 m)
Longest span110 ft (33.5 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,998 (2023)
Projected traffic4,330 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

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$2.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 20 over Debris Channel built?

It was built in 2000, making it 25 years old in 2025.

What condition is SR 20 over Debris Channel in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does SR 20 over Debris Channel carry?

About 2,998 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 20 over Debris Channel?

The structure is 119 ft (36.3 m) long with a longest span of 110 ft (33.5 m) and a deck 44 ft wide.

Who owns SR 20 over Debris Channel?

It is owned by the State Highway Agency.