US Bridges

I 15 Nbl over Samaria Road Gs

Fair

Oneida County, Idaho · 6.8 S. Malad · Structure no. 000000000010970

Built
1975
50 years old
Condition
Fair
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 Nbl over Samaria Road Gs is a prestressed concrete stringer/multi-beam or girder carrying I 15 Nbl 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 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 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 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI 15 Nbl
CrossesSamaria Road Gs
Location6.8 S. Malad
RouteInterstate 15
CountyOneida County
StateIdaho
Coordinates42.08744, -112.21861
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 closed0.6 mi (1 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 Nbl over Samaria Road Gs built?

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

What condition is I 15 Nbl over Samaria Road Gs 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 October 2023.

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

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

How long is I 15 Nbl 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 Nbl over Samaria Road Gs?

It is owned by the State Highway Agency.