US Bridges

Forest Grove RD over S Fork Mcdonald CR 072

Good

Fergus County, Montana · Grassrange · Structure no. L14202025+03001

Built
2011
14 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
1 main span
Daily traffic
120
2023 count
Owner
County
County Highway Agency

About this bridge

Forest Grove RD over S Fork Mcdonald CR 072 is a steel stringer/multi-beam or girder carrying Forest Grove RD over S Fork Mcdonald CR 072 in Fergus County, Montana. It was built in 2011, so it is 14 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 120 vehicles a day, roughly 3% of them trucks, projected to reach 127 by 2043. The structure is 80 ft (24.4 m) long and 25 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesForest Grove RD
CrossesS Fork Mcdonald CR 072
LocationGrassrange
RouteCounty Highway 14202
CountyFergus County
StateMontana
Coordinates47.023, -108.80521
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 protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating47.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span79 ft (24.1 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic120 (2023)
Projected traffic127 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$63,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Forest Grove RD over S Fork Mcdonald CR 072 built?

It was built in 2011, making it 14 years old in 2025.

What condition is Forest Grove RD over S Fork Mcdonald CR 072 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 August 2024.

How much traffic does Forest Grove RD over S Fork Mcdonald CR 072 carry?

About 120 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Forest Grove RD over S Fork Mcdonald CR 072?

The structure is 80 ft (24.4 m) long with a longest span of 79 ft (24.1 m) and a deck 25 ft wide.

Who owns Forest Grove RD over S Fork Mcdonald CR 072?

It is owned by the County Highway Agency.