US Bridges

SR 20 over Damnation CR

Good

Skagit County, Washington · 17.4 E JCT SR 530 · Structure no. 0016159A0000000

Built
2001
24 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
121 ft
1 main span
Daily traffic
1,930
2023 count
Owner
State
State Highway Agency

About this bridge

SR 20 over Damnation CR is a prestressed concrete stringer/multi-beam or girder carrying SR 20 over Damnation CR in Skagit County, Washington. It was built in 2001, so it is 24 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 1,930 vehicles a day, roughly 7% of them trucks, projected to reach 2,848 by 2039. The structure is 121 ft (36.9 m) long and 36 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSR 20
CrossesDamnation CR
Location17.4 E JCT SR 530
RouteState Highway 20
CountySkagit County
StateWashington
Coordinates48.62706, -121.33851
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating99 US tons
Inventory rating62.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length121 ft (36.9 m)
Longest span116 ft (35.4 m)
Deck width36 ft (11.1 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,930 (2023)
Projected traffic2,848 by 2039
Trucks7%
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$2.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 20 over Damnation CR built?

It was built in 2001, making it 24 years old in 2025.

What condition is SR 20 over Damnation CR 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 July 2023.

How much traffic does SR 20 over Damnation CR carry?

About 1,930 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 20 over Damnation CR?

The structure is 121 ft (36.9 m) long with a longest span of 116 ft (35.4 m) and a deck 36 ft wide.

Who owns SR 20 over Damnation CR?

It is owned by the State Highway Agency.