US Bridges

SR77 over SR77

Fair

Pinal County, Arizona · 13.0 MI NE JCT SR 79 · Structure no. 20000

Built
1957
68 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
4,835
2022 count
Owner
State
State Highway Agency

About this bridge

SR77 over SR77 is a concrete slab carrying SR77 over SR77 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 22 ft (6.7 m) long and 80 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesSR77
CrossesSR77
Location13.0 MI NE JCT SR 79
RouteState Highway 77
CountyPinal County
StateArizona
Coordinates32.63197, -110.73967
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.1 US tons
Inventory rating46 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width80 ft (24.4 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 structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR77 over SR77 built?

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

What condition is SR77 over SR77 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 December 2024.

How much traffic does SR77 over SR77 carry?

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

How long is SR77 over SR77?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 80 ft wide.

Who owns SR77 over SR77?

It is owned by the State Highway Agency.