US Bridges

State Route 180 over Alta Main Canal

Fair

Fresno County, California · 06-FRE-180-78.60 · Structure no. 42 0077

Built
1959
66 years old, rebuilt 1995
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
128 ft
4 main spans
Daily traffic
4,375
2015 count
Owner
State
State Highway Agency

About this bridge

State Route 180 over Alta Main Canal is a concrete continuous slab carrying State Route 180 over Alta Main Canal in Fresno County, California. It was built in 1959 and reconstructed in 1995, so it is 66 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 4,375 vehicles a day, roughly 14% of them trucks, projected to reach 11,357 by 2040. The structure is 128 ft (39 m) long and 43 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesState Route 180
CrossesAlta Main Canal
Location06-FRE-180-78.60
RouteState Highway 180
CountyFresno County
StateCalifornia
Coordinates36.71814, -119.43702
Functional classRural Principal Arterial - Other

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length128 ft (39 m)
Longest span36 ft (11 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,375 (2015)
Projected traffic11,357 by 2040
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.1 mi (50 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 180 over Alta Main Canal built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1995.

What condition is State Route 180 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 October 2023.

How much traffic does State Route 180 over Alta Main Canal carry?

About 4,375 vehicles per day (2015 count), of which roughly 14% are trucks.

How long is State Route 180 over Alta Main Canal?

The structure is 128 ft (39 m) long with a longest span of 36 ft (11 m) and a deck 43 ft wide.

Who owns State Route 180 over Alta Main Canal?

It is owned by the State Highway Agency.