US Bridges

M NW over West Canal

Good

Grant County, Washington · M NW 0.2 S of 11 · Structure no. 087145000000000

Built
2004
21 years old
Condition
Good
inspected January 2024
Type
Tee Beam
Prestressed Concrete
Length
115 ft
1 main span
Daily traffic
560
2021 count
Owner
County
County Highway Agency

About this bridge

M NW over West Canal is a prestressed concrete tee beam carrying M 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 560 vehicles a day, roughly 21% of them trucks, projected to reach 730 by 2043. The structure is 115 ft (35.1 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesM NW
CrossesWest Canal
LocationM NW 0.2 S of 11
RouteCounty Highway 91017
Coordinates47.24661, -119.76812
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length115 ft (35.1 m)
Longest span113 ft (34.4 m)
Deck width36 ft (11 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic560 (2021)
Projected traffic730 by 2043
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$4.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was M NW over West Canal built?

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

What condition is M 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 January 2024.

How much traffic does M NW over West Canal carry?

About 560 vehicles per day (2021 count), of which roughly 21% are trucks.

How long is M NW over West Canal?

The structure is 115 ft (35.1 m) long with a longest span of 113 ft (34.4 m) and a deck 36 ft wide.

Who owns M NW over West Canal?

It is owned by the County Highway Agency.