US Bridges

SR 51 over Thomas Road

Good

Maricopa County, Arizona · Thomas RD & SR 51 · Structure no. 02416

Built
1989
36 years old
Condition
Good
inspected December 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
350 ft
3 main spans
Daily traffic
180,704
2022 count
Owner
State
State Highway Agency

About this bridge

SR 51 over Thomas Road is a prestressed concrete continuous box beam or girders - single or spread carrying SR 51 over Thomas Road in Maricopa County, Arizona. It was built in 1989, so it is 36 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 180,704 vehicles a day, roughly 7% of them trucks, projected to reach 180,714 by 2042. The structure is 350 ft (106.7 m) long and 129 ft wide.

Location

Open in Google Maps
CarriesSR 51
CrossesThomas Road
LocationThomas RD & SR 51
RouteState Highway 51
CountyMaricopa County
StateArizona
Coordinates33.47984, -112.03838
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating40 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length350 ft (106.7 m)
Longest span183 ft (55.8 m)
Deck width129 ft (39.4 m)
Roadway width124 ft (37.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180,704 (2022)
Projected traffic180,714 by 2042
Trucks7%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 51 over Thomas Road built?

It was built in 1989, making it 36 years old in 2025.

What condition is SR 51 over Thomas Road in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does SR 51 over Thomas Road carry?

About 180,704 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SR 51 over Thomas Road?

The structure is 350 ft (106.7 m) long with a longest span of 183 ft (55.8 m) and a deck 129 ft wide.

Who owns SR 51 over Thomas Road?

It is owned by the State Highway Agency.