US Bridges

Thomas Road over I 17

Good

Maricopa County, Arizona · 0.4 MI N JCT I 10 · Structure no. 01984

Built
1988
37 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
172 ft
2 main spans
Daily traffic
37,752
2021 count
Owner
State
State Highway Agency

About this bridge

Thomas Road over I 17 is a prestressed concrete stringer/multi-beam or girder carrying Thomas Road over I 17 in Maricopa County, Arizona. It was built in 1988, so it is 37 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 37,752 vehicles a day, roughly 5% of them trucks, projected to reach 37,762 by 2041. The structure is 172 ft (52.4 m) long and 115 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesThomas Road
CrossesI 17
Location0.4 MI N JCT I 10
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.4806, -112.1134
Functional classUrban Other Principal Arterial

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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length172 ft (52.4 m)
Longest span84 ft (25.6 m)
Deck width115 ft (35.1 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,752 (2021)
Projected traffic37,762 by 2041
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3,000 (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Thomas Road over I 17 built?

It was built in 1988, making it 37 years old in 2025.

What condition is Thomas Road over I 17 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 July 2024.

How much traffic does Thomas Road over I 17 carry?

About 37,752 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Thomas Road over I 17?

The structure is 172 ft (52.4 m) long with a longest span of 84 ft (25.6 m) and a deck 115 ft wide.

Who owns Thomas Road over I 17?

It is owned by the State Highway Agency.