US Bridges

SR 51 over Loop 101

Fair

Maricopa County, Arizona · JCT L101 · Structure no. 01469

Built
2003
22 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
708 ft
4 main spans
Daily traffic
20,788
2022 count
Owner
State
State Highway Agency

About this bridge

SR 51 over Loop 101 is a prestressed concrete continuous box beam or girders - single or spread carrying SR 51 over Loop 101 in Maricopa County, Arizona. It was built in 2003, so it is 22 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 20,788 vehicles a day, roughly 7% of them trucks, projected to reach 20,798 by 2042. The structure is 708 ft (215.8 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 51
CrossesLoop 101
LocationJCT L101
RouteState Highway 51
CountyMaricopa County
StateArizona
Coordinates33.67129, -111.99877
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionNovember 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 rating99 US tons
Inventory rating57 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length708 ft (215.8 m)
Longest span206 ft (62.8 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,788 (2022)
Projected traffic20,798 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 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 Loop 101 built?

It was built in 2003, making it 22 years old in 2025.

What condition is SR 51 over Loop 101 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 November 2023.

How much traffic does SR 51 over Loop 101 carry?

About 20,788 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SR 51 over Loop 101?

The structure is 708 ft (215.8 m) long with a longest span of 206 ft (62.8 m) and a deck 43 ft wide.

Who owns SR 51 over Loop 101?

It is owned by the State Highway Agency.