US Bridges

SR 79 over Cap Canal

Fair

Pinal County, Arizona · 1.3 MI S JCT SR 287 · Structure no. 01416

Built
1983
42 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
205 ft
3 main spans
Daily traffic
3,471
2022 count
Owner
State
State Highway Agency

About this bridge

SR 79 over Cap Canal is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 79 over Cap Canal in Pinal County, Arizona. It was built in 1983, so it is 42 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 3,471 vehicles a day, roughly 17% of them trucks, projected to reach 8,037 by 2042. The structure is 205 ft (62.5 m) long and 64 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

CarriesSR 79
CrossesCap Canal
Location1.3 MI S JCT SR 287
RouteState Highway 79
StateArizona
Coordinates33.0094, -111.3765
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length205 ft (62.5 m)
Longest span78 ft (23.8 m)
Deck width64 ft (19.6 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deck20 ft (6.1 m)

Traffic and service

Average daily traffic3,471 (2022)
Projected traffic8,037 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 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 79 over Cap Canal built?

It was built in 1983, making it 42 years old in 2025.

What condition is SR 79 over Cap 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 79 over Cap Canal carry?

About 3,471 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is SR 79 over Cap Canal?

The structure is 205 ft (62.5 m) long with a longest span of 78 ft (23.8 m) and a deck 64 ft wide.

Who owns SR 79 over Cap Canal?

It is owned by the State Highway Agency.