US Bridges

I 15 Sbl over Rapid Creek;inkom

Fair

Bannock County, Idaho · 0.1 E. Inkom · Structure no. 000000000011170

Built
1963
62 years old
Condition
Fair
inspected June 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
151 ft
3 main spans
Daily traffic
7,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Sbl over Rapid Creek;inkom is a prestressed concrete stringer/multi-beam or girder carrying I 15 Sbl over Rapid Creek;inkom in Bannock County, Idaho. It was built in 1963, so it is 62 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 7,750 vehicles a day, roughly 24% of them trucks, projected to reach 11,625 by 2042. The structure is 151 ft (46 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 15 Sbl
CrossesRapid Creek;inkom
Location0.1 E. Inkom
RouteInterstate 15
CountyBannock County
StateIdaho
Coordinates42.79694, -112.25003
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length151 ft (46 m)
Longest span49 ft (14.9 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,750 (2023)
Projected traffic11,625 by 2042
Trucks24%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 15 Sbl over Rapid Creek;inkom built?

It was built in 1963, making it 62 years old in 2025.

What condition is I 15 Sbl over Rapid Creek;inkom 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 June 2021.

How much traffic does I 15 Sbl over Rapid Creek;inkom carry?

About 7,750 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is I 15 Sbl over Rapid Creek;inkom?

The structure is 151 ft (46 m) long with a longest span of 49 ft (14.9 m) and a deck 40 ft wide.

Who owns I 15 Sbl over Rapid Creek;inkom?

It is owned by the State Highway Agency.