US Bridges

IRR SR 87 over San Tan Canal

Good

Pinal County, Arizona · 4.7 MI NW of JCT SR 187 · Structure no. 04632

Built
1959
66 years old, rebuilt 1986
Condition
Good
inspected October 2021
Type
Culvert
Concrete Continuous
Length
24 ft
1 main span
Daily traffic
9,000
2020 count
Owner
State
State Highway Agency

About this bridge

IRR SR 87 over San Tan Canal is a concrete continuous culvert carrying IRR SR 87 over San Tan Canal in Pinal County, Arizona. It was built in 1959 and reconstructed in 1986, so it is 66 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,000 vehicles a day, roughly 8% of them trucks, projected to reach 9,010 by 2040. The structure is 24 ft (7.3 m) long and 48 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesIRR SR 87
CrossesSan Tan Canal
Location4.7 MI NW of JCT SR 187
RouteState Highway 87
CountyPinal County
StateArizona
Coordinates33.1179, -111.729
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width48 ft (14.5 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2020)
Projected traffic9,010 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

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 IRR SR 87 over San Tan Canal built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1986.

What condition is IRR SR 87 over San Tan Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2021.

How much traffic does IRR SR 87 over San Tan Canal carry?

About 9,000 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is IRR SR 87 over San Tan Canal?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 48 ft wide.

Who owns IRR SR 87 over San Tan Canal?

It is owned by the State Highway Agency.