US Bridges

Highland Avenue over SR 51

Fair

Maricopa County, Arizona · SR 51 @ Highland · Structure no. 02422

Built
1988
37 years old
Condition
Fair
inspected December 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
145 ft
2 main spans
Daily traffic
28,018
2018 count
Owner
State
State Highway Agency

About this bridge

Highland Avenue over SR 51 is a prestressed concrete continuous box beam or girders - single or spread carrying Highland Avenue over SR 51 in Maricopa County, Arizona. It was built in 1988, so it is 37 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 28,018 vehicles a day, roughly 2% of them trucks, projected to reach 28,028 by 2038. The structure is 145 ft (44.2 m) long and 97 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHighland Avenue
CrossesSR 51
LocationSR 51 @ Highland
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.5056, -112.0443
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.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span72 ft (21.9 m)
Deck width97 ft (29.5 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,018 (2018)
Projected traffic28,028 by 2038
Trucks2%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Highland Avenue over SR 51 built?

It was built in 1988, making it 37 years old in 2025.

What condition is Highland Avenue over SR 51 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 Highland Avenue over SR 51 carry?

About 28,018 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is Highland Avenue over SR 51?

The structure is 145 ft (44.2 m) long with a longest span of 72 ft (21.9 m) and a deck 97 ft wide.

Who owns Highland Avenue over SR 51?

It is owned by the State Highway Agency.