US Bridges

I-I0 over Watson RD

Good

Maricopa County, Arizona · Watson RD & I-10 · Structure no. 20181

Built
2023
2 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
220 ft
2 main spans
Daily traffic
73,548
2021 count
Owner
State
State Highway Agency

About this bridge

I-I0 over Watson RD is a concrete continuous stringer/multi-beam or girder carrying I-I0 over Watson RD in Maricopa County, Arizona. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 73,548 vehicles a day, roughly 22% of them trucks, projected to reach 73,558 by 2041. The structure is 220 ft (67.1 m) long and 159 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-I0
CrossesWatson RD
LocationWatson RD & I-10
RouteInterstate 10
CountyMaricopa County
StateArizona
Coordinates33.4446, -112.5567
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.2 US tons
Inventory rating56.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length220 ft (67.1 m)
Longest span107 ft (32.6 m)
Deck width159 ft (48.4 m)
Roadway width152 ft (46.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73,548 (2021)
Projected traffic73,558 by 2041
Trucks22%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
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-I0 over Watson RD built?

It was built in 2023, making it 2 years old in 2025.

What condition is I-I0 over Watson RD 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-I0 over Watson RD carry?

About 73,548 vehicles per day (2021 count), of which roughly 22% are trucks.

How long is I-I0 over Watson RD?

The structure is 220 ft (67.1 m) long with a longest span of 107 ft (32.6 m) and a deck 159 ft wide.

Who owns I-I0 over Watson RD?

It is owned by the State Highway Agency.