US Bridges

FAS 472;MONTGOMERY over I 8

Fair

Pinal County, Arizona · 10.8 MI W of JCT I-10 · Structure no. 01140

Built
1966
59 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
256 ft
4 main spans
Daily traffic
464
2022 count
Owner
State
State Highway Agency

About this bridge

FAS 472;MONTGOMERY over I 8 is a steel continuous stringer/multi-beam or girder carrying FAS 472;MONTGOMERY over I 8 in Pinal County, Arizona. It was built in 1966, so it is 59 years old, older 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 5 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 464 vehicles a day, roughly 5% of them trucks, projected to reach 474 by 2042. The structure is 256 ft (78 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFAS 472;MONTGOMERY
CrossesI 8
Location10.8 MI W of JCT I-10
RouteCounty Highway 0
CountyPinal County
StateArizona
Coordinates32.8277, -111.8605
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length256 ft (78 m)
Longest span78 ft (23.8 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic464 (2022)
Projected traffic474 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
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 FAS 472;MONTGOMERY over I 8 built?

It was built in 1966, making it 59 years old in 2025.

What condition is FAS 472;MONTGOMERY over I 8 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 October 2023.

How much traffic does FAS 472;MONTGOMERY over I 8 carry?

About 464 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is FAS 472;MONTGOMERY over I 8?

The structure is 256 ft (78 m) long with a longest span of 78 ft (23.8 m) and a deck 33 ft wide.

Who owns FAS 472;MONTGOMERY over I 8?

It is owned by the State Highway Agency.