US Bridges

Swan Road over Nookachamps Creek

Fair

Skagit County, Washington · 0.37W JCT Babcock/Mudlake · Structure no. 081111000000000

Built
1976
49 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
126 ft
2 main spans
Daily traffic
1,100
2020 count
Owner
County
County Highway Agency

About this bridge

Swan Road over Nookachamps Creek is a concrete stringer/multi-beam or girder carrying Swan Road over Nookachamps Creek 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 1,100 vehicles a day, roughly 8% of them trucks, projected to reach 1,635 by 2044. The structure is 126 ft (38.4 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSwan Road
CrossesNookachamps Creek
Location0.37W JCT Babcock/Mudlake
RouteCounty Highway 78000
CountySkagit County
StateWashington
Coordinates48.45375, -122.27166
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span62 ft (18.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2020)
Projected traffic1,635 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Swan Road over Nookachamps Creek built?

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

What condition is Swan Road over Nookachamps Creek 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 August 2024.

How much traffic does Swan Road over Nookachamps Creek carry?

About 1,100 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Swan Road over Nookachamps Creek?

The structure is 126 ft (38.4 m) long with a longest span of 62 ft (18.9 m) and a deck 30 ft wide.

Who owns Swan Road over Nookachamps Creek?

It is owned by the County Highway Agency.