US Bridges

I 15 over Int Kidd

Fair

Beaverhead County, Montana · 5.6M N Dell-Kidd LN · Structure no. I00015029+06021

Built
1971
54 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
2,116
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 over Int Kidd is a concrete continuous slab carrying I 15 over Int Kidd in Beaverhead County, Montana. It was built in 1971, so it is 54 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 2,116 vehicles a day, roughly 25% of them trucks, projected to reach 2,264 by 2043. The structure is 78 ft (23.8 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI 15
CrossesInt Kidd
Location5.6M N Dell-Kidd LN
RouteInterstate 15
CountyBeaverhead County
StateMontana
Coordinates44.7957, -112.76618
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating31 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span30 ft (9.1 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,116 (2023)
Projected traffic2,264 by 2043
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 over Int Kidd built?

It was built in 1971, making it 54 years old in 2025.

What condition is I 15 over Int Kidd 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 2024.

How much traffic does I 15 over Int Kidd carry?

About 2,116 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I 15 over Int Kidd?

The structure is 78 ft (23.8 m) long with a longest span of 30 ft (9.1 m) and a deck 44 ft wide.

Who owns I 15 over Int Kidd?

It is owned by the State Highway Agency.