US Bridges

A-Nw over W 22 Canal

Good

Grant County, Washington · A NW 1.4 N of 9 NW · Structure no. 087115000000000

Built
2003
22 years old
Condition
Good
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
467
2020 count
Owner
County
County Highway Agency

About this bridge

A-Nw over W 22 Canal is a prestressed concrete tee beam carrying A-Nw over W 22 Canal in Grant County, Washington. It was built in 2003, so it is 22 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 467 vehicles a day, roughly 17% of them trucks, projected to reach 750 by 2042. The structure is 78 ft (23.8 m) long and 34 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesA-Nw
CrossesW 22 Canal
LocationA NW 1.4 N of 9 NW
RouteCounty Highway 37950
Coordinates47.24252, -119.51149
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating46.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length78 ft (23.8 m)
Longest span77 ft (23.5 m)
Deck width34 ft (10.4 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic467 (2020)
Projected traffic750 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 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 A-Nw over W 22 Canal built?

It was built in 2003, making it 22 years old in 2025.

What condition is A-Nw over W 22 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 2023.

How much traffic does A-Nw over W 22 Canal carry?

About 467 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is A-Nw over W 22 Canal?

The structure is 78 ft (23.8 m) long with a longest span of 77 ft (23.5 m) and a deck 34 ft wide.

Who owns A-Nw over W 22 Canal?

It is owned by the County Highway Agency.