US Bridges

91st Ave over Rid Canal

Fair

Maricopa County, Arizona · At Mcdowell RD · Structure no. 09289

Built
1972
53 years old, rebuilt 2004
Condition
Fair
inspected November 2024
Type
Culvert
Concrete Continuous
Length
27 ft
3 main spans
Daily traffic
26,627
2023 count
Owner
County
County Highway Agency

About this bridge

91st Ave over Rid Canal is a concrete continuous culvert carrying 91st Ave over Rid Canal in Maricopa County, Arizona. It was built in 1972 and reconstructed in 2004, so it is 53 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 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 26,627 vehicles a day, roughly 10% of them trucks, projected to reach 26,637 by 2042. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries91st Ave
CrossesRid Canal
LocationAt Mcdowell RD
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.46505, -112.25526
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 36 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span17 ft (5.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck25 ft (7.6 m)

Traffic and service

Average daily traffic26,627 (2023)
Projected traffic26,637 by 2042
Trucks10%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 91st Ave over Rid Canal built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2004.

What condition is 91st Ave over Rid 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 November 2024.

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

About 26,627 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 91st Ave over Rid Canal?

The structure is 27 ft (8.2 m) long with a longest span of 17 ft (5.2 m).

Who owns 91st Ave over Rid Canal?

It is owned by the County Highway Agency.