US Bridges

I 15 over Int Hardy-Hardy Creek

Good

Cascade County, Montana · 7M S Cascade · Structure no. I00015247+02992

Built
1968
57 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
211 ft
4 main spans
Daily traffic
2,218
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 over Int Hardy-Hardy Creek is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Int Hardy-Hardy Creek in Cascade County, Montana. It was built in 1968, so it is 57 years old, older than the Montana average of 47 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 2,218 vehicles a day, roughly 16% of them trucks, projected to reach 2,361 by 2043. The structure is 211 ft (64.3 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
CrossesInt Hardy-Hardy Creek
Location7M S Cascade
RouteInterstate 15
CountyCascade County
StateMontana
Coordinates47.18934, -111.80776
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length211 ft (64.3 m)
Longest span61 ft (18.7 m)
Deck width40 ft (12.1 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,218 (2023)
Projected traffic2,361 by 2043
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and waterway
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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 15 over Int Hardy-Hardy Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is I 15 over Int Hardy-Hardy Creek 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 July 2024.

How much traffic does I 15 over Int Hardy-Hardy Creek carry?

About 2,218 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I 15 over Int Hardy-Hardy Creek?

The structure is 211 ft (64.3 m) long with a longest span of 61 ft (18.7 m) and a deck 40 ft wide.

Who owns I 15 over Int Hardy-Hardy Creek?

It is owned by the State Highway Agency.