US Bridges

Maintenance Road over Main Canal

Good

Grant County, Washington · Main Canal 3.88 · Structure no. 11MC-0004

Built
1977
48 years old
Condition
Good
inspected February 2021
Type
Slab
Concrete
Length
40 ft
1 main span
Daily traffic
10
2021 count
Owner
Federal
Bureau of Reclamation

About this bridge

Maintenance Road over Main Canal is a concrete slab carrying Maintenance Road over Main Canal in Grant County, Washington. It was built in 1977, so it is 48 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10 vehicles a day, projected to reach 10 by 2041. The structure is 40 ft (12.2 m) long and 60 ft wide. If it were closed, the detour would be 198.8 mi (320 km).

Location

Open in Google Maps
CarriesMaintenance Road
CrossesMain Canal
LocationMain Canal 3.88
CountyGrant County
StateWashington
Coordinates47.56493, -119.29941
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating110.1 US tons
Inventory rating107.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadRailroad
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width60 ft (18.3 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2021)
Projected traffic10 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed198.8 mi (320 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Reclamation
Maintained byBureau of Reclamation
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Maintenance Road over Main Canal built?

It was built in 1977, making it 48 years old in 2025.

What condition is Maintenance Road over Main 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 February 2021.

How much traffic does Maintenance Road over Main Canal carry?

About 10 vehicles per day (2021 count).

How long is Maintenance Road over Main Canal?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 60 ft wide.

Who owns Maintenance Road over Main Canal?

It is owned by the Bureau of Reclamation.