US Bridges

99th Avenue over Grand Canal

Fair

Maricopa County, Arizona · 1 MI S Glendale Ave · Structure no. 09671

Built
1980
45 years old, rebuilt 1984
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
9,352
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

99th Avenue over Grand Canal is a prestressed concrete box beam or girders - multiple carrying 99th Avenue over Grand Canal in Maricopa County, Arizona. It was built in 1980 and reconstructed in 1984, so it is 45 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 9,352 vehicles a day, roughly 5% of them trucks, projected to reach 9,362 by 2042. The structure is 36 ft (11 m) long and 88 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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Carries99th Avenue
CrossesGrand Canal
Location1 MI S Glendale Ave
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.52286, -112.27239
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span34 ft (10.4 m)
Deck width88 ft (26.8 m)
Roadway width78 ft (23.9 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic9,352 (2023)
Projected traffic9,362 by 2042
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 99th Avenue over Grand Canal built?

It was built in 1980, making it 45 years old in 2025. It was reconstructed in 1984.

What condition is 99th Avenue 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 September 2024.

How much traffic does 99th Avenue over Grand Canal carry?

About 9,352 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is 99th Avenue over Grand Canal?

The structure is 36 ft (11 m) long with a longest span of 34 ft (10.4 m) and a deck 88 ft wide.

Who owns 99th Avenue over Grand Canal?

It is owned by the City or Municipal Highway Agency.