US Bridges

Fairmont RD over Silver Bow Creek

Fair

Silver Bow County, Montana · 10M NW Rocker · Structure no. S00441002+02001

Built
1980
45 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
108 ft
2 main spans
Daily traffic
727
2023 count
Owner
State
State Highway Agency

About this bridge

Fairmont RD over Silver Bow Creek is a prestressed concrete stringer/multi-beam or girder carrying Fairmont RD over Silver Bow Creek in Silver Bow County, Montana. It was built in 1980, so it is 45 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 727 vehicles a day, roughly 2% of them trucks, projected to reach 763 by 2043. The structure is 108 ft (32.8 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFairmont RD
CrossesSilver Bow Creek
Location10M NW Rocker
RouteState Highway 441
StateMontana
Coordinates46.04378, -112.7971
Functional classRural Major Collector

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length108 ft (32.8 m)
Longest span60 ft (18.3 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic727 (2023)
Projected traffic763 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fairmont RD over Silver Bow Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Fairmont RD over Silver Bow Creek 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 2024.

How much traffic does Fairmont RD over Silver Bow Creek carry?

About 727 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Fairmont RD over Silver Bow Creek?

The structure is 108 ft (32.8 m) long with a longest span of 60 ft (18.3 m) and a deck 40 ft wide.

Who owns Fairmont RD over Silver Bow Creek?

It is owned by the State Highway Agency.