US Bridges

Farm to Market RD over Stillwater River 084

Fair

Flathead County, Montana · 12M W Whitefish · Structure no. L15801006+05001

Built
1980
45 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
247 ft
3 main spans
Daily traffic
339
2023 count
Owner
County
County Highway Agency

About this bridge

Farm to Market RD over Stillwater River 084 is a prestressed concrete stringer/multi-beam or girder carrying Farm to Market RD over Stillwater River 084 in Flathead 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 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 339 vehicles a day, roughly 3% of them trucks, projected to reach 363 by 2043. The structure is 247 ft (75.3 m) long and 31 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesFarm to Market RD
CrossesStillwater River 084
Location12M W Whitefish
RouteCounty Highway 15801
CountyFlathead County
StateMontana
Coordinates48.4671, -114.50827
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
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 inspectionOctober 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length247 ft (75.3 m)
Longest span85 ft (25.9 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic339 (2023)
Projected traffic363 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Farm to Market RD over Stillwater River 084 built?

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

What condition is Farm to Market RD over Stillwater River 084 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 2023.

How much traffic does Farm to Market RD over Stillwater River 084 carry?

About 339 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Farm to Market RD over Stillwater River 084?

The structure is 247 ft (75.3 m) long with a longest span of 85 ft (25.9 m) and a deck 31 ft wide.

Who owns Farm to Market RD over Stillwater River 084?

It is owned by the County Highway Agency.