US Bridges

Brentwood DR over Nooksack Slough

Good

Whatcom County, Washington · 0.04 Mi. W. of Gillies RD · Structure no. 089363000000000

Built
2023
2 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
600
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Brentwood DR over Nooksack Slough is a steel stringer/multi-beam or girder carrying Brentwood DR over Nooksack Slough 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 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 600 vehicles a day, roughly 1% of them trucks, projected to reach 601 by 2045. The structure is 60 ft (18.3 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesBrentwood DR
CrossesNooksack Slough
Location0.04 Mi. W. of Gillies RD
RouteCity Street 0
CountyWhatcom County
StateWashington
Coordinates48.93409, -122.3159
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length60 ft (18.3 m)
Longest span59 ft (17.9 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2022)
Projected traffic601 by 2045
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Brentwood DR over Nooksack Slough built?

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

What condition is Brentwood DR over Nooksack Slough 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 October 2023.

How much traffic does Brentwood DR over Nooksack Slough carry?

About 600 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Brentwood DR over Nooksack Slough?

The structure is 60 ft (18.3 m) long with a longest span of 59 ft (17.9 m) and a deck 30 ft wide.

Who owns Brentwood DR over Nooksack Slough?

It is owned by the City or Municipal Highway Agency.