US Bridges

SR 77 over Old SR76

Fair

Pinal County, Arizona · At JCT With Old SR 76 · Structure no. 00499

Built
1957
68 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
96 ft
3 main spans
Daily traffic
4,835
2022 count
Owner
State
State Highway Agency

About this bridge

SR 77 over Old SR76 is a steel stringer/multi-beam or girder carrying SR 77 over Old SR76 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 4,835 vehicles a day, roughly 12% of them trucks, projected to reach 4,845 by 2042. The structure is 96 ft (29.3 m) long and 45 ft wide. If it were closed, the detour would be 62.1 mi (100 km).

Location

Open in Google Maps
CarriesSR 77
CrossesOld SR76
LocationAt JCT With Old SR 76
RouteState Highway 77
CountyPinal County
StateArizona
Coordinates32.6641, -110.6833
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span45 ft (13.7 m)
Deck width45 ft (13.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,835 (2022)
Projected traffic4,845 by 2042
Trucks12%
Lanes on structure2
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 Old SR76 built?

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

What condition is SR 77 over Old SR76 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 SR 77 over Old SR76 carry?

About 4,835 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is SR 77 over Old SR76?

The structure is 96 ft (29.3 m) long with a longest span of 45 ft (13.7 m) and a deck 45 ft wide.

Who owns SR 77 over Old SR76?

It is owned by the State Highway Agency.