US Bridges

SR 76 over Redfield Canyon

Fair

Pima County, Arizona · 21.4 MI S of JCT SR 77 · Structure no. 07563

Built
1971
54 years old
Condition
Fair
inspected January 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
310 ft
4 main spans
Daily traffic
530
2025 count
Owner
County
County Highway Agency

About this bridge

SR 76 over Redfield Canyon is a prestressed concrete continuous box beam or girders - multiple carrying SR 76 over Redfield Canyon in Pima County, Arizona. It was built in 1971, so it is 54 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 6 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 530 vehicles a day, roughly 2% of them trucks, projected to reach 540 by 2042. The structure is 310 ft (94.5 m) long and 47 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesSR 76
CrossesRedfield Canyon
Location21.4 MI S of JCT SR 77
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.4271, -110.4791
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75.9 US tons
Inventory rating39 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length310 ft (94.5 m)
Longest span77 ft (23.5 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic530 (2025)
Projected traffic540 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 76 over Redfield Canyon built?

It was built in 1971, making it 54 years old in 2025.

What condition is SR 76 over Redfield Canyon 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 January 2025.

How much traffic does SR 76 over Redfield Canyon carry?

About 530 vehicles per day (2025 count), of which roughly 2% are trucks.

How long is SR 76 over Redfield Canyon?

The structure is 310 ft (94.5 m) long with a longest span of 77 ft (23.5 m) and a deck 47 ft wide.

Who owns SR 76 over Redfield Canyon?

It is owned by the County Highway Agency.