US Bridges

LA Palma Road over Casa Grande Canal

Fair

Pinal County, Arizona · 0.8 MI S JCT SR 287 · Structure no. 08437

Built
1975
50 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
450
2020 count
Owner
County
County Highway Agency

About this bridge

LA Palma Road over Casa Grande Canal is a prestressed concrete box beam or girders - multiple carrying LA Palma Road over Casa Grande Canal in Pinal County, Arizona. It was built in 1975, so it is 50 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 450 vehicles a day, roughly 1% of them trucks, projected to reach 460 by 2040. The structure is 34 ft (10.4 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLA Palma Road
CrossesCasa Grande Canal
Location0.8 MI S JCT SR 287
RouteCounty Highway 0
CountyPinal County
StateArizona
Coordinates32.8687, -111.5325
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 rating40 US tons
Inventory rating24 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span32 ft (9.8 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deck25 ft (7.6 m)

Traffic and service

Average daily traffic450 (2020)
Projected traffic460 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 LA Palma Road over Casa Grande Canal built?

It was built in 1975, making it 50 years old in 2025.

What condition is LA Palma 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 February 2024.

How much traffic does LA Palma Road over Casa Grande Canal carry?

About 450 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is LA Palma Road over Casa Grande Canal?

The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.8 m) and a deck 36 ft wide.

Who owns LA Palma Road over Casa Grande Canal?

It is owned by the County Highway Agency.