US Bridges

STC2839;500 South over J Canal

Fair

Cassia County, Idaho · 4.1S 1.4W DECLO;730E-500S · Structure no. 000000000019605

Built
1975
50 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
1,800
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2839;500 South over J Canal is a prestressed concrete tee beam carrying STC2839;500 South over J Canal in Cassia County, Idaho. It was built in 1975, so it is 50 years old, older 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 1,800 vehicles a day, roughly 2% of them trucks, projected to reach 2,700 by 2042. The structure is 39 ft (11.9 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC2839;500 South
CrossesJ Canal
Location4.1S 1.4W DECLO;730E-500S
RouteCounty Highway 2839
CountyCassia County
StateIdaho
Coordinates42.45911, -113.65525
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length39 ft (11.9 m)
Longest span38 ft (11.6 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,800 (2023)
Projected traffic2,700 by 2042
Trucks2%
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 STC2839;500 South over J Canal built?

It was built in 1975, making it 50 years old in 2025.

What condition is STC2839;500 South over J 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 2024.

How much traffic does STC2839;500 South over J Canal carry?

About 1,800 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is STC2839;500 South over J Canal?

The structure is 39 ft (11.9 m) long with a longest span of 38 ft (11.6 m) and a deck 36 ft wide.

Who owns STC2839;500 South over J Canal?

It is owned by the Other Local Agency.