US Bridges

US 191 over Assiniboine Creek

Fair

Phillips County, Montana · 6M NE Malta · Structure no. P00099006+00001

Built
1936
89 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
114 ft
6 main spans
Daily traffic
215
2023 count
Owner
State
State Highway Agency

About this bridge

US 191 over Assiniboine Creek is a wood or timber stringer/multi-beam or girder carrying US 191 over Assiniboine Creek in Phillips County, Montana. It was built in 1936, so it is 89 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 215 vehicles a day, roughly 2% of them trucks, projected to reach 226 by 2043. The structure is 114 ft (34.7 m) long and 31 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

CarriesUS 191
CrossesAssiniboine Creek
Location6M NE Malta
RouteU.S. Route 191
StateMontana
Coordinates48.43481, -107.825
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionSeptember 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating29 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadH 15
Structure length114 ft (34.7 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic215 (2023)
Projected traffic226 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible 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 Assiniboine Creek built?

It was built in 1936, making it 89 years old in 2025.

What condition is US 191 over Assiniboine 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 Assiniboine Creek carry?

About 215 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is US 191 over Assiniboine Creek?

The structure is 114 ft (34.7 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns US 191 over Assiniboine Creek?

It is owned by the State Highway Agency.