US Bridges

SR 51 over Northern Avenue

Good

Maricopa County, Arizona · 7.0 MI N JCT I-10 · Structure no. 02193

Built
1993
32 years old
Condition
Good
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
222 ft
2 main spans
Daily traffic
156,280
2022 count
Owner
State
State Highway Agency

About this bridge

SR 51 over Northern Avenue is a prestressed concrete continuous box beam or girders - multiple carrying SR 51 over Northern Avenue in Maricopa County, Arizona. It was built in 1993, so it is 32 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 156,280 vehicles a day, roughly 7% of them trucks, projected to reach 156,290 by 2042. The structure is 222 ft (67.7 m) long and 165 ft wide.

Location

Open in Google Maps
CarriesSR 51
CrossesNorthern Avenue
Location7.0 MI N JCT I-10
RouteState Highway 51
CountyMaricopa County
StateArizona
Coordinates33.5583, -112.0381
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 inspectionNovember 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 rating93 US tons
Inventory rating48 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length222 ft (67.7 m)
Longest span108 ft (32.9 m)
Deck width165 ft (50.4 m)
Roadway width159 ft (48.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic156,280 (2022)
Projected traffic156,290 by 2042
Trucks7%
Lanes on structure10
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 Northern Avenue built?

It was built in 1993, making it 32 years old in 2025.

What condition is SR 51 over Northern Avenue 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 November 2023.

How much traffic does SR 51 over Northern Avenue carry?

About 156,280 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SR 51 over Northern Avenue?

The structure is 222 ft (67.7 m) long with a longest span of 108 ft (32.9 m) and a deck 165 ft wide.

Who owns SR 51 over Northern Avenue?

It is owned by the State Highway Agency.