US Bridges

Flannegan RD over Johnson CR

Fair

Whatcom County, Washington · 0.15 W Garrison RD · Structure no. 080135000000000

Built
1955
70 years old, rebuilt 1975
Condition
Fair
inspected November 2024
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
40
2024 count
Owner
County
County Highway Agency

About this bridge

Flannegan RD over Johnson CR is a concrete channel beam carrying Flannegan RD over Johnson CR in Whatcom County, Washington. It was built in 1955 and reconstructed in 1975, so it is 70 years old, older 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 5 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 40 vehicles a day, roughly 1% of them trucks, projected to reach 80 by 2046. The structure is 31 ft (9.4 m) long and 21 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesFlannegan RD
CrossesJohnson CR
Location0.15 W Garrison RD
RouteCounty Highway 63660
CountyWhatcom County
StateWashington
Coordinates48.98605, -122.28984
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating29 US tons
Inventory rating20 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2024)
Projected traffic80 by 2046
Trucks1%
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

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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Flannegan RD over Johnson CR built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1975.

What condition is Flannegan RD over Johnson CR 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 November 2024.

How much traffic does Flannegan RD over Johnson CR carry?

About 40 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Flannegan RD over Johnson CR?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 21 ft wide.

Who owns Flannegan RD over Johnson CR?

It is owned by the County Highway Agency.