US Bridges

I 10 over 99th Avenue

Good

Maricopa County, Arizona · 0.2 MI W JCT SR 101L · Structure no. 01860

Built
1981
44 years old, rebuilt 2009
Condition
Good
inspected February 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
153 ft
1 main span
Daily traffic
190,817
2021 count
Owner
State
State Highway Agency

About this bridge

I 10 over 99th Avenue is a prestressed concrete box beam or girders - single or spread carrying I 10 over 99th Avenue in Maricopa County, Arizona. It was built in 1981 and reconstructed in 2009, so it is 44 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 190,817 vehicles a day, roughly 10% of them trucks, projected to reach 190,827 by 2041. The structure is 153 ft (46.6 m) long and 173 ft wide.

Location

Open in Google Maps
CarriesI 10
Crosses99th Avenue
Location0.2 MI W JCT SR 101L
RouteInterstate 10
CountyMaricopa County
StateArizona
Coordinates33.46157, -112.27279
Functional classUrban Principal Arterial - Interstate

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 inspectionFebruary 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 rating59 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length153 ft (46.6 m)
Longest span150 ft (45.7 m)
Deck width173 ft (52.8 m)
Roadway width167 ft (50.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190,817 (2021)
Projected traffic190,827 by 2041
Trucks10%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 10 over 99th Avenue built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2009.

What condition is I 10 over 99th 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 February 2023.

How much traffic does I 10 over 99th Avenue carry?

About 190,817 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is I 10 over 99th Avenue?

The structure is 153 ft (46.6 m) long with a longest span of 150 ft (45.7 m) and a deck 173 ft wide.

Who owns I 10 over 99th Avenue?

It is owned by the State Highway Agency.