US Bridges

Imperial Dam Road over Gila Gravity Main Canal

Fair

Yuma County, Arizona · 16 M NE from Yuma Ar · Structure no. 0304-0004

Built
1978
47 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
112 ft
1 main span
Daily traffic
200
2017 count
Owner
Federal
Bureau of Reclamation

About this bridge

Imperial Dam Road over Gila Gravity Main Canal is a prestressed concrete stringer/multi-beam or girder carrying Imperial Dam Road over Gila Gravity Main Canal in Yuma County, Arizona. It was built in 1978, so it is 47 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 200 vehicles a day, projected to reach 500 by 2039. The structure is 112 ft (34.2 m) long and 45 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesImperial Dam Road
CrossesGila Gravity Main Canal
Location16 M NE from Yuma Ar
RouteState Highway 0
CountyYuma County
StateArizona
Coordinates32.8675, -114.4492
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating42.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length112 ft (34.2 m)
Longest span110 ft (33.5 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2017)
Projected traffic500 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Imperial Dam Road over Gila Gravity Main Canal built?

It was built in 1978, making it 47 years old in 2025.

What condition is Imperial Dam Road over Gila Gravity Main Canal in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.

How much traffic does Imperial Dam Road over Gila Gravity Main Canal carry?

About 200 vehicles per day (2017 count).

How long is Imperial Dam Road over Gila Gravity Main Canal?

The structure is 112 ft (34.2 m) long with a longest span of 110 ft (33.5 m) and a deck 45 ft wide.

Who owns Imperial Dam Road over Gila Gravity Main Canal?

It is owned by the Bureau of Reclamation.