US Bridges

Indian School Road over Grand Canal

Fair

Maricopa County, Arizona · 0.06 MI W of 16th Street · Structure no. 09732

Built
1979
46 years old
Condition
Fair
inspected January 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
66 ft
2 main spans
Daily traffic
52,404
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Indian School Road over Grand Canal is a prestressed concrete box beam or girders - multiple carrying Indian School Road over Grand Canal in Maricopa County, Arizona. It was built in 1979, so it is 46 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 52,404 vehicles a day, roughly 1% of them trucks, projected to reach 52,414 by 2041. The structure is 66 ft (20.1 m) long and 96 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIndian School Road
CrossesGrand Canal
Location0.06 MI W of 16th Street
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.4947, -112.0489
Functional classUrban Other Principal 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating61.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span32 ft (9.8 m)
Deck width96 ft (29.3 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,404 (2021)
Projected traffic52,414 by 2041
Trucks1%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Indian School Road over Grand Canal built?

It was built in 1979, making it 46 years old in 2025.

What condition is Indian School Road over Grand 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 January 2023.

How much traffic does Indian School Road over Grand Canal carry?

About 52,404 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Indian School Road over Grand Canal?

The structure is 66 ft (20.1 m) long with a longest span of 32 ft (9.8 m) and a deck 96 ft wide.

Who owns Indian School Road over Grand Canal?

It is owned by the City or Municipal Highway Agency.