US Bridges

790N-1350E over Main Southside Canal

Fair

Cassia County, Idaho · 8.9 N. 5.0 E. Declo · Structure no. 000000000024085

Built
1980
45 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
78 ft
2 main spans
Daily traffic
50
2023 count
Owner
Local
Other Local Agency

About this bridge

790N-1350E over Main Southside Canal is a prestressed concrete tee beam carrying 790N-1350E over Main Southside Canal in Cassia County, Idaho. It was built in 1980, so it is 45 years old, younger than the Idaho average of 45.3 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 78 ft (23.8 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries790N-1350E
CrossesMain Southside Canal
Location8.9 N. 5.0 E. Declo
RouteCounty Highway 0
CountyCassia County
StateIdaho
Coordinates42.64736, -113.53067
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span38 ft (11.6 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 790N-1350E over Main Southside Canal built?

It was built in 1980, making it 45 years old in 2025.

What condition is 790N-1350E over Main Southside 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 March 2023.

How much traffic does 790N-1350E over Main Southside Canal carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 790N-1350E over Main Southside Canal?

The structure is 78 ft (23.8 m) long with a longest span of 38 ft (11.6 m) and a deck 30 ft wide.

Who owns 790N-1350E over Main Southside Canal?

It is owned by the Other Local Agency.