US Bridges

US 191 over Ross Fork Creek

Fair

Fergus County, Montana · 2M N Judith Gap · Structure no. P00063020+07951

Built
1990
35 years old
Condition
Fair
inspected October 2024
Type
Culvert
Steel
Length
20 ft
2 main spans
Daily traffic
2,250
2023 count
Owner
State
State Highway Agency

About this bridge

US 191 over Ross Fork Creek is a steel culvert carrying US 191 over Ross Fork Creek in Fergus County, Montana. It was built in 1990, so it is 35 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 2,250 vehicles a day, roughly 20% of them trucks, projected to reach 2,396 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 123.7 mi (199 km).

CarriesUS 191
CrossesRoss Fork Creek
Location2M N Judith Gap
RouteU.S. Route 191
StateMontana
Coordinates46.71509, -109.73857
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length20 ft (6.1 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,250 (2023)
Projected traffic2,396 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 191 over Ross Fork Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is US 191 over Ross Fork Creek 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 2024.

How much traffic does US 191 over Ross Fork Creek carry?

About 2,250 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is US 191 over Ross Fork Creek?

The structure is 20 ft (6.1 m) long with a longest span of 8 ft (2.4 m).

Who owns US 191 over Ross Fork Creek?

It is owned by the State Highway Agency.