US Bridges

SH 48 over I 15 Nb-Sb;roberts RD Ic

Fair

Jefferson County, Idaho · Near Roberts · Structure no. 000000000014431

Built
1994
31 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
264 ft
4 main spans
Daily traffic
1,400
2023 count
Owner
State
State Highway Agency

About this bridge

SH 48 over I 15 Nb-Sb;roberts RD Ic is a steel continuous stringer/multi-beam or girder carrying SH 48 over I 15 Nb-Sb;roberts RD Ic in Jefferson County, Idaho. It was built in 1994, so it is 31 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 1,400 vehicles a day, roughly 13% of them trucks, projected to reach 2,100 by 2042. The structure is 264 ft (80.5 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesSH 48
CrossesI 15 Nb-Sb;roberts RD Ic
LocationNear Roberts
RouteState Highway 48
CountyJefferson County
StateIdaho
Coordinates43.71714, -112.13511
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.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length264 ft (80.5 m)
Longest span85 ft (25.9 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic2,100 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 48 over I 15 Nb-Sb;roberts RD Ic built?

It was built in 1994, making it 31 years old in 2025.

What condition is SH 48 over I 15 Nb-Sb;roberts RD Ic 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 July 2023.

How much traffic does SH 48 over I 15 Nb-Sb;roberts RD Ic carry?

About 1,400 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SH 48 over I 15 Nb-Sb;roberts RD Ic?

The structure is 264 ft (80.5 m) long with a longest span of 85 ft (25.9 m) and a deck 33 ft wide.

Who owns SH 48 over I 15 Nb-Sb;roberts RD Ic?

It is owned by the State Highway Agency.