US Bridges

County Road over Beaver Creek 143

Good

Fergus County, Montana · 1M W Glengarry · Structure no. 000000202102803

Built
2012
13 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

County Road over Beaver Creek 143 is a steel stringer/multi-beam or girder carrying County Road over Beaver Creek 143 in Fergus County, Montana. It was built in 2012, so it is 13 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 40 ft (12.2 m) long and 20 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

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CarriesCounty Road
CrossesBeaver Creek 143
Location1M W Glengarry
RouteCounty Highway 14307
CountyFergus County
StateMontana
Coordinates47.0265, -109.5717
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span36 ft (11 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 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 County Road over Beaver Creek 143 built?

It was built in 2012, making it 13 years old in 2025.

What condition is County Road over Beaver Creek 143 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does County Road over Beaver Creek 143 carry?

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

How long is County Road over Beaver Creek 143?

The structure is 40 ft (12.2 m) long with a longest span of 36 ft (11 m) and a deck 20 ft wide.

Who owns County Road over Beaver Creek 143?

It is owned by the County Highway Agency.