US Bridges

Tweedy Road over Casa Grande Canal

Fair

Pinal County, Arizona · 0.9 MI N JCT Selma HWY · Structure no. 08619

Built
1980
45 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
49 ft
1 main span
Daily traffic
865
2024 count
Owner
County
County Highway Agency

About this bridge

Tweedy Road over Casa Grande Canal is a steel stringer/multi-beam or girder carrying Tweedy Road over Casa Grande Canal in Pinal County, Arizona. It was built in 1980, so it is 45 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 865 vehicles a day, roughly 5% of them trucks, projected to reach 875 by 2042. The structure is 49 ft (14.9 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesTweedy Road
CrossesCasa Grande Canal
Location0.9 MI N JCT Selma HWY
RouteCounty Highway 0
CountyPinal County
StateArizona
Coordinates32.864, -111.5847
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span42 ft (12.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic865 (2024)
Projected traffic875 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
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 Tweedy Road over Casa Grande Canal built?

It was built in 1980, making it 45 years old in 2025.

What condition is Tweedy Road over Casa Grande 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 Tweedy Road over Casa Grande Canal carry?

About 865 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Tweedy Road over Casa Grande Canal?

The structure is 49 ft (14.9 m) long with a longest span of 42 ft (12.8 m) and a deck 32 ft wide.

Who owns Tweedy Road over Casa Grande Canal?

It is owned by the County Highway Agency.