US Bridges

7 NW over West Canal

Good

Grant County, Washington · 7 NW 0.1 West of R NW · Structure no. 087144000000000

Built
2004
21 years old
Condition
Good
inspected December 2023
Type
Tee Beam
Prestressed Concrete
Length
119 ft
1 main span
Daily traffic
680
2021 count
Owner
County
County Highway Agency

About this bridge

7 NW over West Canal is a prestressed concrete tee beam carrying 7 NW over West Canal in Grant County, Washington. It was built in 2004, so it is 21 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 680 vehicles a day, roughly 21% of them trucks, projected to reach 750 by 2043. The structure is 119 ft (36.3 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries7 NW
CrossesWest Canal
Location7 NW 0.1 West of R NW
RouteCounty Highway 31700
CountyGrant County
StateWashington
Coordinates47.19045, -119.87601
Functional classRural Minor Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating31.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length119 ft (36.3 m)
Longest span118 ft (36 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic680 (2021)
Projected traffic750 by 2043
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 7 NW over West Canal built?

It was built in 2004, making it 21 years old in 2025.

What condition is 7 NW over West Canal 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 December 2023.

How much traffic does 7 NW over West Canal carry?

About 680 vehicles per day (2021 count), of which roughly 21% are trucks.

How long is 7 NW over West Canal?

The structure is 119 ft (36.3 m) long with a longest span of 118 ft (36 m) and a deck 30 ft wide.

Who owns 7 NW over West Canal?

It is owned by the County Highway Agency.