US Bridges

Centennial Ave over RR 015

Fair

Silver Bow County, Montana · W Side Butte · Structure no. L47586000+01001

Built
1955
70 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
162 ft
3 main spans
Daily traffic
2,202
2023 count
Owner
State
State Highway Agency

About this bridge

Centennial Ave over RR 015 is a steel continuous stringer/multi-beam or girder carrying Centennial Ave over RR 015 in Silver Bow County, Montana. It was built in 1955, so it is 70 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 2,202 vehicles a day, roughly 3% of them trucks, projected to reach 2,345 by 2043. The structure is 162 ft (49.5 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCentennial Ave
CrossesRR 015
LocationW Side Butte
RouteCounty Highway 47586
CountySilver Bow County
StateMontana
Coordinates45.99924, -112.56098
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length162 ft (49.5 m)
Longest span67 ft (20.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,202 (2023)
Projected traffic2,345 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 Centennial Ave over RR 015 built?

It was built in 1955, making it 70 years old in 2025.

What condition is Centennial Ave over RR 015 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 Centennial Ave over RR 015 carry?

About 2,202 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Centennial Ave over RR 015?

The structure is 162 ft (49.5 m) long with a longest span of 67 ft (20.3 m) and a deck 28 ft wide.

Who owns Centennial Ave over RR 015?

It is owned by the State Highway Agency.