US Bridges

Thomas Road over Grand Canal

Fair

Maricopa County, Arizona · 0.21 MI W of 24th Street · Structure no. 09201

Built
1927
98 years old, rebuilt 1954
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
55 ft
3 main spans
Daily traffic
36,393
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Thomas Road over Grand Canal is a concrete continuous slab carrying Thomas Road over Grand Canal in Maricopa County, Arizona. It was built in 1927 and reconstructed in 1954, so it is 98 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 5 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 36,393 vehicles a day, roughly 1% of them trucks, projected to reach 36,403 by 2042. The structure is 55 ft (16.8 m) long and 75 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesThomas Road
CrossesGrand Canal
Location0.21 MI W of 24th Street
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.4803, -112.034
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating39.4 US tons
Inventory rating23.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span20 ft (6.1 m)
Deck width75 ft (23 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,393 (2024)
Projected traffic36,403 by 2042
Trucks1%
Lanes on structure5
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Thomas Road over Grand Canal built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1954.

What condition is Thomas 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 2025.

How much traffic does Thomas Road over Grand Canal carry?

About 36,393 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Thomas Road over Grand Canal?

The structure is 55 ft (16.8 m) long with a longest span of 20 ft (6.1 m) and a deck 75 ft wide.

Who owns Thomas Road over Grand Canal?

It is owned by the City or Municipal Highway Agency.