US Bridges

Birch Creek RD over Smith River 001

Fair

Meagher County, Montana · 4M NW White Sulphur Spr · Structure no. L30107003+01001

Built
1973
52 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
61 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Birch Creek RD over Smith River 001 is a wood or timber stringer/multi-beam or girder carrying Birch Creek RD over Smith River 001 in Meagher County, Montana. It was built in 1973, so it is 52 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 61 ft (18.6 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesBirch Creek RD
CrossesSmith River 001
Location4M NW White Sulphur Spr
RouteCounty Highway 30201
StateMontana
Coordinates46.54824, -111.00919
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 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 rating53.2 US tons
Inventory rating32.8 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length61 ft (18.6 m)
Longest span59 ft (17.9 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Birch Creek RD over Smith River 001 built?

It was built in 1973, making it 52 years old in 2025.

What condition is Birch Creek RD over Smith River 001 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 Birch Creek RD over Smith River 001 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Birch Creek RD over Smith River 001?

The structure is 61 ft (18.6 m) long with a longest span of 59 ft (17.9 m) and a deck 25 ft wide.

Who owns Birch Creek RD over Smith River 001?

It is owned by the County Highway Agency.