US Bridges

SR B 79 over Casa Grande Canal

Fair

Pinal County, Arizona · 0.5 MI S JCT SR 287 · Structure no. 00669

Built
1961
64 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
58 ft
1 main span
Daily traffic
3,137
2022 count
Owner
State
State Highway Agency

About this bridge

SR B 79 over Casa Grande Canal is a prestressed concrete box beam or girders - multiple carrying SR B 79 over Casa Grande Canal in Pinal County, Arizona. It was built in 1961, so it is 64 years old, older 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 3,137 vehicles a day, roughly 19% of them trucks, projected to reach 8,941 by 2042. The structure is 58 ft (17.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR B 79
CrossesCasa Grande Canal
Location0.5 MI S JCT SR 287
RouteState Highway 79
CountyPinal County
StateArizona
Coordinates33.0155, -111.3836
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating38 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length58 ft (17.7 m)
Longest span55 ft (16.8 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,137 (2022)
Projected traffic8,941 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SR B 79 over Casa Grande Canal built?

It was built in 1961, making it 64 years old in 2025.

What condition is SR B 79 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 February 2024.

How much traffic does SR B 79 over Casa Grande Canal carry?

About 3,137 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is SR B 79 over Casa Grande Canal?

The structure is 58 ft (17.7 m) long with a longest span of 55 ft (16.8 m) and a deck 43 ft wide.

Who owns SR B 79 over Casa Grande Canal?

It is owned by the State Highway Agency.