US Bridges

SR 51 over Mcdowell Road

Fair

Maricopa County, Arizona · SR 51 @ Mcdowell · Structure no. 02414

Built
1987
38 years old, rebuilt 2003
Condition
Fair
inspected December 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
260 ft
1 main span
Daily traffic
180,704
2022 count
Owner
State
State Highway Agency

About this bridge

SR 51 over Mcdowell Road is a prestressed concrete box beam or girders - multiple carrying SR 51 over Mcdowell Road in Maricopa County, Arizona. It was built in 1987 and reconstructed in 2003, so it is 38 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 180,704 vehicles a day, roughly 7% of them trucks, projected to reach 180,714 by 2042. The structure is 260 ft (79.2 m) long and 156 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesSR 51
CrossesMcdowell Road
LocationSR 51 @ Mcdowell
RouteState Highway 51
CountyMaricopa County
StateArizona
Coordinates33.46546, -112.03812
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
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 rating66 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length260 ft (79.2 m)
Longest span221 ft (67.4 m)
Deck width156 ft (47.6 m)
Roadway width151 ft (46 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180,704 (2022)
Projected traffic180,714 by 2042
Trucks7%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed13 mi (21 km)
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 Mcdowell Road built?

It was built in 1987, making it 38 years old in 2025. It was reconstructed in 2003.

What condition is SR 51 over Mcdowell Road 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 2023.

How much traffic does SR 51 over Mcdowell Road carry?

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

How long is SR 51 over Mcdowell Road?

The structure is 260 ft (79.2 m) long with a longest span of 221 ft (67.4 m) and a deck 156 ft wide.

Who owns SR 51 over Mcdowell Road?

It is owned by the State Highway Agency.