US Bridges

Thunderbird RD over Drainage Ditch

Fair

Maricopa County, Arizona · At 99th Ave Median · Structure no. 09683

Built
1972
53 years old, rebuilt 1997
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
24,345
2020 count
Owner
County
County Highway Agency

About this bridge

Thunderbird RD over Drainage Ditch is a concrete continuous culvert carrying Thunderbird RD over Drainage Ditch in Maricopa County, Arizona. It was built in 1972 and reconstructed in 1997, 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 24,345 vehicles a day, roughly 10% of them trucks, projected to reach 24,355 by 2040. The structure is 22 ft (6.7 m) long and 90 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesThunderbird RD
CrossesDrainage Ditch
LocationAt 99th Ave Median
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.60932, -112.26795
Functional classUrban Collector

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 inspectionDecember 2022
Inspection intervalevery 36 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span11 ft (3.4 m)
Deck width90 ft (27.4 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,345 (2020)
Projected traffic24,355 by 2040
Trucks10%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Thunderbird RD over Drainage Ditch built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 1997.

What condition is Thunderbird RD over Drainage Ditch 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 December 2022.

How much traffic does Thunderbird RD over Drainage Ditch carry?

About 24,345 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Thunderbird RD over Drainage Ditch?

The structure is 22 ft (6.7 m) long with a longest span of 11 ft (3.4 m) and a deck 90 ft wide.

Who owns Thunderbird RD over Drainage Ditch?

It is owned by the County Highway Agency.