US Bridges

IRR - US 191 over Big Warm Creek

Fair

Phillips County, Montana · 23M SW Malta · Structure no. P00061133+04251

Built
1941
84 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
101 ft
4 main spans
Daily traffic
395
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - US 191 over Big Warm Creek is a wood or timber stringer/multi-beam or girder carrying IRR - US 191 over Big Warm Creek in Phillips County, Montana. It was built in 1941, so it is 84 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 395 vehicles a day, roughly 9% of them trucks, projected to reach 415 by 2043. The structure is 101 ft (30.9 m) long and 26 ft wide. If it were closed, the detour would be 90.7 mi (146 km).

Location

Open in Google Maps
CarriesIRR - US 191
CrossesBig Warm Creek
Location23M SW Malta
RouteU.S. Route 191
CountyPhillips County
StateMontana
Coordinates48.08797, -108.16892
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.
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 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 alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 15
Structure length101 ft (30.9 m)
Longest span25 ft (7.6 m)
Deck width26 ft (7.9 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic395 (2023)
Projected traffic415 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed90.7 mi (146 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR - US 191 over Big Warm Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is IRR - US 191 over Big Warm 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 IRR - US 191 over Big Warm Creek carry?

About 395 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is IRR - US 191 over Big Warm Creek?

The structure is 101 ft (30.9 m) long with a longest span of 25 ft (7.6 m) and a deck 26 ft wide.

Who owns IRR - US 191 over Big Warm Creek?

It is owned by the State Highway Agency.