US Bridges

SR 539 over Duffner Ditch

Good

Whatcom County, Washington · 3.6 N JCT SR 544 · Structure no. 0019935A0000000

Built
2023
2 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete
Length
25 ft
1 main span
Daily traffic
13,480
2023 count
Owner
State
State Highway Agency

About this bridge

SR 539 over Duffner Ditch is a concrete culvert carrying SR 539 over Duffner Ditch in Whatcom County, Washington. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,480 vehicles a day, roughly 7% of them trucks, projected to reach 24,337 by 2039. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesSR 539
CrossesDuffner Ditch
Location3.6 N JCT SR 544
RouteState Highway 539
CountyWhatcom County
StateWashington
Coordinates48.94333, -122.48533
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating42.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,480 (2023)
Projected traffic24,337 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemYes

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$499,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 539 over Duffner Ditch built?

It was built in 2023, making it 2 years old in 2025.

What condition is SR 539 over Duffner Ditch 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 November 2023.

How much traffic does SR 539 over Duffner Ditch carry?

About 13,480 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 539 over Duffner Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m).

Who owns SR 539 over Duffner Ditch?

It is owned by the State Highway Agency.