US Bridges

SR 77 over Piper Springs

Good

Pinal County, Arizona · 1.9 MI S JCT SR 177 · Structure no. 04391

Built
1965
60 years old
Condition
Good
inspected February 2022
Type
Culvert
Concrete Continuous
Length
50 ft
4 main spans
Daily traffic
2,411
2021 count
Owner
State
State Highway Agency

About this bridge

SR 77 over Piper Springs is a concrete continuous culvert carrying SR 77 over Piper Springs in Pinal County, Arizona. It was built in 1965, so it is 60 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,411 vehicles a day, roughly 12% of them trucks, projected to reach 2,422 by 2041. The structure is 50 ft (15.2 m) long and 52 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 77
CrossesPiper Springs
Location1.9 MI S JCT SR 177
RouteState Highway 77
CountyPinal County
StateArizona
Coordinates32.9651, -110.7545
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span10 ft (3 m)
Deck width52 ft (15.8 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,411 (2021)
Projected traffic2,422 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 SR 77 over Piper Springs built?

It was built in 1965, making it 60 years old in 2025.

What condition is SR 77 over Piper Springs in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2022.

How much traffic does SR 77 over Piper Springs carry?

About 2,411 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is SR 77 over Piper Springs?

The structure is 50 ft (15.2 m) long with a longest span of 10 ft (3 m) and a deck 52 ft wide.

Who owns SR 77 over Piper Springs?

It is owned by the State Highway Agency.