US Bridges

59th Avenue over Sl 101

Fair

Maricopa County, Arizona · 4.21 MI W of JCT I 17 · Structure no. 02053

Built
1990
35 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
257 ft
2 main spans
Daily traffic
19,568
2021 count
Owner
State
State Highway Agency

About this bridge

59th Avenue over Sl 101 is a prestressed concrete continuous box beam or girders - single or spread carrying 59th Avenue over Sl 101 in Maricopa County, Arizona. It was built in 1990, so it is 35 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 19,568 vehicles a day, roughly 5% of them trucks, projected to reach 19,578 by 2041. The structure is 257 ft (78.3 m) long and 109 ft wide.

Location

Open in Google Maps
Carries59th Avenue
CrossesSl 101
Location4.21 MI W of JCT I 17
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.6678, -112.1867
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating48 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length257 ft (78.3 m)
Longest span128 ft (39 m)
Deck width109 ft (33.1 m)
Roadway width92 ft (28 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic19,568 (2021)
Projected traffic19,578 by 2041
Trucks5%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 59th Avenue over Sl 101 built?

It was built in 1990, making it 35 years old in 2025.

What condition is 59th Avenue over Sl 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 April 2023.

How much traffic does 59th Avenue over Sl 101 carry?

About 19,568 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is 59th Avenue over Sl 101?

The structure is 257 ft (78.3 m) long with a longest span of 128 ft (39 m) and a deck 109 ft wide.

Who owns 59th Avenue over Sl 101?

It is owned by the State Highway Agency.