US Bridges

US 191 over Armells Creek

Fair

Fergus County, Montana · 27M NE Roy · Structure no. P00061086+04811

Built
1963
62 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
173 ft
3 main spans
Daily traffic
655
2023 count
Owner
State
State Highway Agency

About this bridge

US 191 over Armells Creek is a prestressed concrete stringer/multi-beam or girder carrying US 191 over Armells Creek in Fergus County, Montana. It was built in 1963, so it is 62 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 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 655 vehicles a day, roughly 6% of them trucks, projected to reach 688 by 2043. The structure is 173 ft (52.7 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesUS 191
CrossesArmells Creek
Location27M NE Roy
RouteU.S. Route 191
CountyFergus County
StateMontana
Coordinates47.61112, -108.69472
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length173 ft (52.7 m)
Longest span72 ft (21.9 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic655 (2023)
Projected traffic688 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$317,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 191 over Armells Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is US 191 over Armells 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 September 2023.

How much traffic does US 191 over Armells Creek carry?

About 655 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 191 over Armells Creek?

The structure is 173 ft (52.7 m) long with a longest span of 72 ft (21.9 m) and a deck 31 ft wide.

Who owns US 191 over Armells Creek?

It is owned by the State Highway Agency.