US Bridges

Piedra RD over Alta Main Canal

Fair

Fresno County, California · 1.71 MI S Weldon Ave · Structure no. 42C0068

Built
1965
60 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete Continuous
Length
121 ft
4 main spans
Daily traffic
1,700
2010 count
Owner
County
County Highway Agency

About this bridge

Piedra RD over Alta Main Canal is a concrete continuous slab carrying Piedra RD over Alta Main Canal in Fresno County, California. It was built in 1965, so it is 60 years old, older than the California average of 54.8 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 1,700 vehicles a day, roughly 3% of them trucks, projected to reach 3,247 by 2043. The structure is 121 ft (36.9 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesPiedra RD
CrossesAlta Main Canal
Location1.71 MI S Weldon Ave
RouteCounty Highway 0
CountyFresno County
StateCalifornia
Coordinates36.75208, -119.44179
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length121 ft (36.9 m)
Longest span30 ft (9.1 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2010)
Projected traffic3,247 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Piedra RD over Alta Main Canal built?

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

What condition is Piedra RD over Alta Main Canal 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 Piedra RD over Alta Main Canal carry?

About 1,700 vehicles per day (2010 count), of which roughly 3% are trucks.

How long is Piedra RD over Alta Main Canal?

The structure is 121 ft (36.9 m) long with a longest span of 30 ft (9.1 m) and a deck 33 ft wide.

Who owns Piedra RD over Alta Main Canal?

It is owned by the County Highway Agency.