US Bridges

Union Hills Drive over Loop 101

Fair

Maricopa County, Arizona · 0.4 MI N of JCT US 60 · Structure no. 02002

Built
1990
35 years old, rebuilt 2011
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
253 ft
2 main spans
Daily traffic
31,685
2021 count
Owner
State
State Highway Agency

About this bridge

Union Hills Drive over Loop 101 is a prestressed concrete continuous box beam or girders - single or spread carrying Union Hills Drive over Loop 101 in Maricopa County, Arizona. It was built in 1990 and reconstructed in 2011, 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 31,685 vehicles a day, roughly 3% of them trucks, projected to reach 31,695 by 2041. The structure is 253 ft (77.1 m) long and 148 ft wide.

Location

Open in Google Maps
CarriesUnion Hills Drive
CrossesLoop 101
Location0.4 MI N of JCT US 60
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.6527, -112.2328
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88 US tons
Inventory rating53 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length253 ft (77.1 m)
Longest span125 ft (38.1 m)
Deck width148 ft (45 m)
Roadway width134 ft (40.7 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic31,685 (2021)
Projected traffic31,695 by 2041
Trucks3%
Lanes on structure10
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 Union Hills Drive over Loop 101 built?

It was built in 1990, making it 35 years old in 2025. It was reconstructed in 2011.

What condition is Union Hills Drive 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 April 2023.

How much traffic does Union Hills Drive over Loop 101 carry?

About 31,685 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Union Hills Drive over Loop 101?

The structure is 253 ft (77.1 m) long with a longest span of 125 ft (38.1 m) and a deck 148 ft wide.

Who owns Union Hills Drive over Loop 101?

It is owned by the State Highway Agency.