US Bridges

Houghton RD NB over Union Pacific RR

Good

Pima County, Arizona · 1.4 MI N from I-10 · Structure no. 11543

Built
2018
7 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
349 ft
3 main spans
Daily traffic
8,940
2022 count
Owner
County
County Highway Agency

About this bridge

Houghton RD NB over Union Pacific RR is a prestressed concrete stringer/multi-beam or girder carrying Houghton RD NB over Union Pacific RR in Pima County, Arizona. It was built in 2018, so it is 7 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 8,940 vehicles a day, roughly 5% of them trucks, projected to reach 8,950 by 2042. The structure is 349 ft (106.4 m) long and 60 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesHoughton RD NB
CrossesUnion Pacific RR
Location1.4 MI N from I-10
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.0819, -110.7724
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionDecember 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 rating93 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length349 ft (106.4 m)
Longest span133 ft (40.5 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,940 (2022)
Projected traffic8,950 by 2042
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Houghton RD NB over Union Pacific RR built?

It was built in 2018, making it 7 years old in 2025.

What condition is Houghton RD NB over Union Pacific RR 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 December 2023.

How much traffic does Houghton RD NB over Union Pacific RR carry?

About 8,940 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Houghton RD NB over Union Pacific RR?

The structure is 349 ft (106.4 m) long with a longest span of 133 ft (40.5 m) and a deck 60 ft wide.

Who owns Houghton RD NB over Union Pacific RR?

It is owned by the County Highway Agency.