US Bridges

I 15 Sbl over Samaria Road Gs

Good

Oneida County, Idaho · 6.8 S. Malad · Structure no. 000000000010975

Built
1975
50 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
113 ft
3 main spans
Daily traffic
6,250
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Sbl over Samaria Road Gs is a prestressed concrete stringer/multi-beam or girder carrying I 15 Sbl over Samaria Road Gs in Oneida 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,250 vehicles a day, roughly 22% of them trucks, projected to reach 9,375 by 2042. The structure is 113 ft (34.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 15 Sbl
CrossesSamaria Road Gs
Location6.8 S. Malad
RouteInterstate 15
CountyOneida County
StateIdaho
Coordinates42.08778, -112.21906
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span60 ft (18.3 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,250 (2023)
Projected traffic9,375 by 2042
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 Sbl over Samaria Road Gs built?

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

What condition is I 15 Sbl over Samaria Road Gs in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does I 15 Sbl over Samaria Road Gs carry?

About 6,250 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is I 15 Sbl over Samaria Road Gs?

The structure is 113 ft (34.4 m) long with a longest span of 60 ft (18.3 m) and a deck 44 ft wide.

Who owns I 15 Sbl over Samaria Road Gs?

It is owned by the State Highway Agency.