US Bridges

91st Ave over Grand Canal

Fair

Maricopa County, Arizona · N. of Bethany Home RD · Structure no. 09685

Built
1981
44 years old, rebuilt 2006
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
33 ft
1 main span
Daily traffic
9,864
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

91st Ave over Grand Canal is a prestressed concrete box beam or girders - multiple carrying 91st Ave over Grand Canal in Maricopa County, Arizona. It was built in 1981 and reconstructed in 2006, so it is 44 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 9,864 vehicles a day, roughly 5% of them trucks, projected to reach 9,874 by 2042. The structure is 33 ft (10.1 m) long and 112 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries91st Ave
CrossesGrand Canal
LocationN. of Bethany Home RD
RouteCity Street 0
StateArizona
Coordinates33.5233, -112.2551
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 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 rating69 US tons
Inventory rating41 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span32 ft (9.8 m)
Deck width112 ft (34.1 m)
Roadway width96 ft (29.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,864 (2023)
Projected traffic9,874 by 2042
Trucks5%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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 91st Ave over Grand Canal built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2006.

What condition is 91st Ave 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 2025.

How much traffic does 91st Ave over Grand Canal carry?

About 9,864 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is 91st Ave over Grand Canal?

The structure is 33 ft (10.1 m) long with a longest span of 32 ft (9.8 m) and a deck 112 ft wide.

Who owns 91st Ave over Grand Canal?

It is owned by the City or Municipal Highway Agency.