US Bridges

SR 51 over Osborn Road

Fair

Maricopa County, Arizona · SR 51 @ Osborn · Structure no. 02419

Built
1987
38 years old
Condition
Fair
inspected December 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
222 ft
3 main spans
Daily traffic
180,062
2022 count
Owner
State
State Highway Agency

About this bridge

SR 51 over Osborn Road is a prestressed concrete continuous box beam or girders - single or spread carrying SR 51 over Osborn Road in Maricopa County, Arizona. It was built in 1987, 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 180,062 vehicles a day, roughly 7% of them trucks, projected to reach 180,072 by 2042. The structure is 222 ft (67.7 m) long and 130 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesSR 51
CrossesOsborn Road
LocationSR 51 @ Osborn
RouteState Highway 51
CountyMaricopa County
StateArizona
Coordinates33.48722, -112.04194
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length222 ft (67.7 m)
Longest span100 ft (30.5 m)
Deck width130 ft (39.7 m)
Roadway width125 ft (38.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180,062 (2022)
Projected traffic180,072 by 2042
Trucks7%
Lanes on structure8
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 Osborn Road built?

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

What condition is SR 51 over Osborn 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 Osborn Road carry?

About 180,062 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SR 51 over Osborn Road?

The structure is 222 ft (67.7 m) long with a longest span of 100 ft (30.5 m) and a deck 130 ft wide.

Who owns SR 51 over Osborn Road?

It is owned by the State Highway Agency.