US Bridges

S 41 over Fish Creek

Fair

Silver Bow County, Montana · 6M N Silverstar · Structure no. P00029059+08921

Built
1934
91 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
56 ft
3 main spans
Daily traffic
407
2023 count
Owner
State
State Highway Agency

About this bridge

S 41 over Fish Creek is a wood or timber stringer/multi-beam or girder carrying S 41 over Fish Creek in Silver Bow County, Montana. It was built in 1934, so it is 91 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 407 vehicles a day, roughly 2% of them trucks, projected to reach 427 by 2043. The structure is 56 ft (17.2 m) long and 22 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

Location

Open in Google Maps
CarriesS 41
CrossesFish Creek
Location6M N Silverstar
RouteState Highway 41
CountySilver Bow County
StateMontana
Coordinates45.76956, -112.23459
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 15
Structure length56 ft (17.2 m)
Longest span19 ft (5.7 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic407 (2023)
Projected traffic427 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$111,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S 41 over Fish Creek built?

It was built in 1934, making it 91 years old in 2025.

What condition is S 41 over Fish 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 August 2023.

How much traffic does S 41 over Fish Creek carry?

About 407 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is S 41 over Fish Creek?

The structure is 56 ft (17.2 m) long with a longest span of 19 ft (5.7 m) and a deck 22 ft wide.

Who owns S 41 over Fish Creek?

It is owned by the State Highway Agency.