US Bridges

I 15 over Rr-Local

Fair

Silver Bow County, Montana · Butte · Structure no. I00015125+08831

Built
2010
15 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
256 ft
2 main spans
Daily traffic
7,379
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 over Rr-Local is a steel continuous box beam or girders - multiple carrying I 15 over Rr-Local in Silver Bow County, Montana. It was built in 2010, so it is 15 years old, younger 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 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 7,379 vehicles a day, roughly 15% of them trucks, projected to reach 7,747 by 2043. The structure is 256 ft (78 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 15
CrossesRr-Local
LocationButte
RouteInterstate 15
CountySilver Bow County
StateMontana
Coordinates45.99237, -112.54821
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating48 US tons
Inventory rating37 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length256 ft (78 m)
Longest span127 ft (38.8 m)
Deck width39 ft (12 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,379 (2023)
Projected traffic7,747 by 2043
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 over Rr-Local built?

It was built in 2010, making it 15 years old in 2025.

What condition is I 15 over Rr-Local 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 March 2023.

How much traffic does I 15 over Rr-Local carry?

About 7,379 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I 15 over Rr-Local?

The structure is 256 ft (78 m) long with a longest span of 127 ft (38.8 m) and a deck 39 ft wide.

Who owns I 15 over Rr-Local?

It is owned by the State Highway Agency.