US Bridges

US 60 over Waterfall Canyon

Poor

Pinal County, Arizona · 2.6 MI E JCT SR 177 · Structure no. 00328

Built
1929
96 years old, rebuilt 1949
Condition
Poor
inspected February 2024
Type
Tee Beam
Concrete
Length
96 ft
4 main spans
Daily traffic
8,079
2022 count
Owner
State
State Highway Agency

About this bridge

US 60 over Waterfall Canyon is a concrete tee beam carrying US 60 over Waterfall Canyon in Pinal County, Arizona. It was built in 1929 and reconstructed in 1949, so it is 96 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 8,079 vehicles a day, roughly 16% of them trucks, projected to reach 8,079 by 2042. The structure is 96 ft (29.3 m) long and 44 ft wide. If it were closed, the detour would be 37.3 mi (60 km).

Location

Open in Google Maps
CarriesUS 60
CrossesWaterfall Canyon
Location2.6 MI E JCT SR 177
RouteU.S. Route 60
CountyPinal County
StateArizona
Coordinates33.30972, -111.06781
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span24 ft (7.3 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,079 (2022)
Projected traffic8,079 by 2042
Trucks16%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.3 mi (60 km)
TollOn a free road
National Highway SystemYes

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 US 60 over Waterfall Canyon built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1949.

What condition is US 60 over Waterfall Canyon in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does US 60 over Waterfall Canyon carry?

About 8,079 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is US 60 over Waterfall Canyon?

The structure is 96 ft (29.3 m) long with a longest span of 24 ft (7.3 m) and a deck 44 ft wide.

Who owns US 60 over Waterfall Canyon?

It is owned by the State Highway Agency.