US Bridges

I 84 Wbl over Southside Canal

Fair

Cassia County, Idaho · 9.4 E. Burley · Structure no. 000000000016410

Built
1960
65 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
211 ft
3 main spans
Daily traffic
9,500
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 Wbl over Southside Canal is a prestressed concrete stringer/multi-beam or girder carrying I 84 Wbl over Southside Canal in Cassia County, Idaho. It was built in 1960, so it is 65 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 5 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 9,500 vehicles a day, roughly 38% of them trucks, projected to reach 14,250 by 2042. The structure is 211 ft (64.3 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 84 Wbl
CrossesSouthside Canal
Location9.4 E. Burley
RouteInterstate 84
CountyCassia County
StateIdaho
Coordinates42.56889, -113.60367
Functional classRural Principal Arterial - Interstate

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadHS 20
Structure length211 ft (64.3 m)
Longest span77 ft (23.6 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,500 (2023)
Projected traffic14,250 by 2042
Trucks38%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.5 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 84 Wbl over Southside Canal built?

It was built in 1960, making it 65 years old in 2025.

What condition is I 84 Wbl over 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 November 2024.

How much traffic does I 84 Wbl over Southside Canal carry?

About 9,500 vehicles per day (2023 count), of which roughly 38% are trucks.

How long is I 84 Wbl over Southside Canal?

The structure is 211 ft (64.3 m) long with a longest span of 77 ft (23.6 m) and a deck 35 ft wide.

Who owns I 84 Wbl over Southside Canal?

It is owned by the State Highway Agency.