US Bridges

100 South Road over I 84;100 South RD Gs 1

Fair

Jerome County, Idaho · 1.2 E. Jerome · Structure no. 000000000024840

Built
1965
60 years old
Condition
Fair
inspected August 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
254 ft
3 main spans
Daily traffic
1,400
2023 count
Owner
State
State Highway Agency

About this bridge

100 South Road over I 84;100 South RD Gs 1 is a prestressed concrete stringer/multi-beam or girder carrying 100 South Road over I 84;100 South RD Gs 1 in Jerome County, Idaho. It was built in 1965, 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 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 1,400 vehicles a day, roughly 15% of them trucks, projected to reach 2,100 by 2042. The structure is 254 ft (77.4 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries100 South Road
CrossesI 84;100 South RD Gs 1
Location1.2 E. Jerome
RouteCounty Highway 0
CountyJerome County
StateIdaho
Coordinates42.70967, -114.53401
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span56 ft (17.1 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic2,100 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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$3.8 million (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 100 South Road over I 84;100 South RD Gs 1 built?

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

What condition is 100 South Road over I 84;100 South RD Gs 1 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 August 2022.

How much traffic does 100 South Road over I 84;100 South RD Gs 1 carry?

About 1,400 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is 100 South Road over I 84;100 South RD Gs 1?

The structure is 254 ft (77.4 m) long with a longest span of 56 ft (17.1 m) and a deck 29 ft wide.

Who owns 100 South Road over I 84;100 South RD Gs 1?

It is owned by the State Highway Agency.