US Bridges

SR 77 over Abandoned Railroad

Fair

Pinal County, Arizona · 0.2 MI N of JCT Old SR 76 · Structure no. 00500

Built
1957
68 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
112 ft
2 main spans
Daily traffic
3,526
2022 count
Owner
State
State Highway Agency

About this bridge

SR 77 over Abandoned Railroad is a steel continuous stringer/multi-beam or girder carrying SR 77 over Abandoned Railroad in Pinal County, Arizona. It was built in 1957, so it is 68 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 3,526 vehicles a day, roughly 10% of them trucks, projected to reach 3,536 by 2042. The structure is 112 ft (34.1 m) long and 45 ft wide. If it were closed, the detour would be 62.1 mi (100 km).

Location

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CarriesSR 77
CrossesAbandoned Railroad
Location0.2 MI N of JCT Old SR 76
RouteState Highway 77
CountyPinal County
StateArizona
Coordinates32.6647, -110.6812
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span60 ft (18.3 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,526 (2022)
Projected traffic3,536 by 2042
Trucks10%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed62.1 mi (100 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 77 over Abandoned Railroad built?

It was built in 1957, making it 68 years old in 2025.

What condition is SR 77 over Abandoned Railroad 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 August 2023.

How much traffic does SR 77 over Abandoned Railroad carry?

About 3,526 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is SR 77 over Abandoned Railroad?

The structure is 112 ft (34.1 m) long with a longest span of 60 ft (18.3 m) and a deck 45 ft wide.

Who owns SR 77 over Abandoned Railroad?

It is owned by the State Highway Agency.