US Bridges

Birky RD over S Fork Smith River 028

Fair

Meagher County, Montana · 7M SW White Sulphur Spr · Structure no. L30124001+02001

Built
1980
45 years old
Condition
Fair
inspected December 2023
Type
Tee Beam
Concrete
Length
31 ft
1 main span
Daily traffic
68
2023 count
Owner
County
County Highway Agency

About this bridge

Birky RD over S Fork Smith River 028 is a concrete tee beam carrying Birky RD over S Fork Smith River 028 in Meagher 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 68 vehicles a day, roughly 3% of them trucks, projected to reach 73 by 2043. The structure is 31 ft (9.4 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesBirky RD
CrossesS Fork Smith River 028
Location7M SW White Sulphur Spr
RouteCounty Highway 30202
StateMontana
Coordinates46.44651, -110.93049
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckOther
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic68 (2023)
Projected traffic73 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Birky RD over S Fork Smith River 028 built?

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

What condition is Birky RD over S Fork Smith River 028 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 December 2023.

How much traffic does Birky RD over S Fork Smith River 028 carry?

About 68 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Birky RD over S Fork Smith River 028?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 26 ft wide.

Who owns Birky RD over S Fork Smith River 028?

It is owned by the County Highway Agency.