US Bridges

Gripp Road over Samish River

Fair

Skagit County, Washington · 0.1 E JCT Prairie Road · Structure no. 079958000000000

Built
1976
49 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
84 ft
1 main span
Daily traffic
679
2021 count
Owner
County
County Highway Agency

About this bridge

Gripp Road over Samish River is a prestressed concrete stringer/multi-beam or girder carrying Gripp Road over Samish River in Skagit County, Washington. It was built in 1976, so it is 49 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 679 vehicles a day, roughly 12% of them trucks, projected to reach 1,009 by 2041. The structure is 84 ft (25.5 m) long and 30 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesGripp Road
CrossesSamish River
Location0.1 E JCT Prairie Road
RouteCounty Highway 66000
CountySkagit County
StateWashington
Coordinates48.55489, -122.28969
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65.4 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length84 ft (25.5 m)
Longest span80 ft (24.5 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic679 (2021)
Projected traffic1,009 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Gripp Road over Samish River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Gripp Road over Samish 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 September 2023.

How much traffic does Gripp Road over Samish River carry?

About 679 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is Gripp Road over Samish River?

The structure is 84 ft (25.5 m) long with a longest span of 80 ft (24.5 m) and a deck 30 ft wide.

Who owns Gripp Road over Samish River?

It is owned by the County Highway Agency.