US Bridges

100 South Road over L Canal

Fair

Jerome County, Idaho · 1.2 S. 7.0 E. Jerome · Structure no. 000000000024645

Built
1965
60 years old, rebuilt 1996
Condition
Fair
inspected November 2023
Type
Slab
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
60
2023 count
Owner
Local
Other Local Agency

About this bridge

100 South Road over L Canal is a prestressed concrete slab carrying 100 South Road over L Canal in Jerome County, Idaho. It was built in 1965 and reconstructed in 1996, so it is 60 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 60 vehicles a day, roughly 50% of them trucks, projected to reach 90 by 2042. The structure is 24 ft (7.3 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries100 South Road
CrossesL Canal
Location1.2 S. 7.0 E. Jerome
RouteCounty Highway 0
CountyJerome County
StateIdaho
Coordinates42.70783, -114.38242
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.
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 protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width38 ft (11.6 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2023)
Projected traffic90 by 2042
Trucks50%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$298,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 100 South Road over L Canal built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1996.

What condition is 100 South Road over L 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 2023.

How much traffic does 100 South Road over L Canal carry?

About 60 vehicles per day (2023 count), of which roughly 50% are trucks.

How long is 100 South Road over L Canal?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 38 ft wide.

Who owns 100 South Road over L Canal?

It is owned by the Other Local Agency.