US Bridges

IRR SR 87 over Pima Lateral Canal

Fair

Pinal County, Arizona · 3.4 MI W JCT SR 287 · Structure no. 00579

Built
1920
105 years old, rebuilt 1960
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
62 ft
3 main spans
Daily traffic
11,494
2022 count
Owner
State
State Highway Agency

About this bridge

IRR SR 87 over Pima Lateral Canal is a concrete continuous slab carrying IRR SR 87 over Pima Lateral Canal in Pinal County, Arizona. It was built in 1920 and reconstructed in 1960, so it is 105 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 5 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 11,494 vehicles a day, roughly 6% of them trucks, projected to reach 26,614 by 2042. The structure is 62 ft (18.9 m) long and 45 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesIRR SR 87
CrossesPima Lateral Canal
Location3.4 MI W JCT SR 287
RouteState Highway 87
CountyPinal County
StateArizona
Coordinates33.0025, -111.5771
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span20 ft (6.1 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,494 (2022)
Projected traffic26,614 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR SR 87 over Pima Lateral Canal built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1960.

What condition is IRR SR 87 over Pima Lateral 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 IRR SR 87 over Pima Lateral Canal carry?

About 11,494 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is IRR SR 87 over Pima Lateral Canal?

The structure is 62 ft (18.9 m) long with a longest span of 20 ft (6.1 m) and a deck 45 ft wide.

Who owns IRR SR 87 over Pima Lateral Canal?

It is owned by the State Highway Agency.