US Bridges

Jones RD over Sleasman Slough

Fair

Whatcom County, Washington · 00.3 E Nims RD · Structure no. 084350000000000

Built
1935
90 years old, rebuilt 1994
Condition
Fair
inspected February 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
150
2023 count
Owner
County
County Highway Agency

About this bridge

Jones RD over Sleasman Slough is a concrete channel beam carrying Jones RD over Sleasman Slough in Whatcom County, Washington. It was built in 1935 and reconstructed in 1994, so it is 90 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 150 vehicles a day, roughly 17% of them trucks, projected to reach 225 by 2045. 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

Open in Google Maps
CarriesJones RD
CrossesSleasman Slough
Location00.3 E Nims RD
RouteCounty Highway 68020
CountyWhatcom County
StateWashington
Coordinates48.99989, -122.17592
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating27 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span31 ft (9.4 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2023)
Projected traffic225 by 2045
Trucks17%
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 statusNot eligible for the National Register of Historic Places
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 Jones RD over Sleasman Slough built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1994.

What condition is Jones RD over Sleasman Slough 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 February 2023.

How much traffic does Jones RD over Sleasman Slough carry?

About 150 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is Jones RD over Sleasman Slough?

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

Who owns Jones RD over Sleasman Slough?

It is owned by the County Highway Agency.