US Bridges

D Street over SR 543 Southbound

Good

Whatcom County, Washington · 0.8 N JCT I-5 · Structure no. 0017064B0000000

Built
2007
18 years old
Condition
Good
inspected May 2023
Type
Slab
Concrete
Length
52 ft
1 main span
Daily traffic
6,423
2008 count
Owner
State
State Highway Agency

About this bridge

D Street over SR 543 Southbound is a concrete slab carrying D Street over SR 543 Southbound in Whatcom County, Washington. It was built in 2007, so it is 18 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 6,423 vehicles a day, roughly 5% of them trucks. The structure is 52 ft (15.9 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesD Street
CrossesSR 543 Southbound
Location0.8 N JCT I-5
RouteCity Street 0
Coordinates48.99814, -122.73533
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating33 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length52 ft (15.9 m)
Longest span40 ft (12.2 m)
Deck width74 ft (22.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,423 (2008)
Projected traffic—
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 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$1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was D Street over SR 543 Southbound built?

It was built in 2007, making it 18 years old in 2025.

What condition is D Street over SR 543 Southbound 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 May 2023.

How much traffic does D Street over SR 543 Southbound carry?

About 6,423 vehicles per day (2008 count), of which roughly 5% are trucks.

How long is D Street over SR 543 Southbound?

The structure is 52 ft (15.9 m) long with a longest span of 40 ft (12.2 m) and a deck 74 ft wide.

Who owns D Street over SR 543 Southbound?

It is owned by the State Highway Agency.