US Bridges

12 RD NW over West Canal

Good

Grant County, Washington · Martin RD 0.1 W of SR 28 · Structure no. 086094000000000

Built
1994
31 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
140 ft
1 main span
Daily traffic
825
2020 count
Owner
County
County Highway Agency

About this bridge

12 RD NW over West Canal is a prestressed concrete tee beam carrying 12 RD NW over West Canal in Grant County, Washington. It was built in 1994, so it is 31 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 825 vehicles a day, roughly 15% of them trucks, projected to reach 1,100 by 2042. The structure is 140 ft (42.7 m) long and 41 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Carries12 RD NW
CrossesWest Canal
LocationMartin RD 0.1 W of SR 28
RouteCounty Highway 30400
Coordinates47.28096, -119.58341
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating26.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20 + Mod
Structure length140 ft (42.7 m)
Longest span139 ft (42.4 m)
Deck width41 ft (12.5 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic825 (2020)
Projected traffic1,100 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$2.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 12 RD NW over West Canal built?

It was built in 1994, making it 31 years old in 2025.

What condition is 12 RD 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 November 2024.

How much traffic does 12 RD NW over West Canal carry?

About 825 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is 12 RD NW over West Canal?

The structure is 140 ft (42.7 m) long with a longest span of 139 ft (42.4 m) and a deck 41 ft wide.

Who owns 12 RD NW over West Canal?

It is owned by the County Highway Agency.