US Bridges

NB SR 539 over Wiser Lake

Good

Whatcom County, Washington · 0.9 N JCT SR 544 · Structure no. 0017469A0000000

Built
2009
16 years old
Condition
Good
inspected May 2022
Type
Slab
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
8,009
2023 count
Owner
State
State Highway Agency

About this bridge

NB SR 539 over Wiser Lake is a prestressed concrete slab carrying NB SR 539 over Wiser Lake in Whatcom County, Washington. It was built in 2009, so it is 16 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,009 vehicles a day, roughly 6% of them trucks, projected to reach 12,287 by 2039. The structure is 67 ft (20.4 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNB SR 539
CrossesWiser Lake
Location0.9 N JCT SR 544
RouteState Highway 539
CountyWhatcom County
StateWashington
Coordinates48.90472, -122.48542
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length67 ft (20.4 m)
Longest span64 ft (19.5 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,009 (2023)
Projected traffic12,287 by 2039
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NB SR 539 over Wiser Lake built?

It was built in 2009, making it 16 years old in 2025.

What condition is NB SR 539 over Wiser Lake 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 2022.

How much traffic does NB SR 539 over Wiser Lake carry?

About 8,009 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is NB SR 539 over Wiser Lake?

The structure is 67 ft (20.4 m) long with a longest span of 64 ft (19.5 m) and a deck 41 ft wide.

Who owns NB SR 539 over Wiser Lake?

It is owned by the State Highway Agency.