US Bridges

IRR - US 191 over West Alkali Creek

Good

Phillips County, Montana · 13M SW Malta · Structure no. P00061143+03411

Built
2008
17 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
395
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - US 191 over West Alkali Creek is a concrete culvert carrying IRR - US 191 over West Alkali Creek in Phillips County, Montana. It was built in 2008, so it is 17 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 395 vehicles a day, roughly 9% of them trucks, projected to reach 415 by 2043. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 90.7 mi (146 km).

CarriesIRR - US 191
CrossesWest Alkali Creek
Location13M SW Malta
RouteU.S. Route 191
StateMontana
Coordinates48.20586, -108.0555
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length30 ft (9.1 m)
Longest span14 ft (4.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 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 West Alkali Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is IRR - US 191 over West Alkali Creek 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 February 2024.

How much traffic does IRR - US 191 over West Alkali Creek carry?

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

How long is IRR - US 191 over West Alkali Creek?

The structure is 30 ft (9.1 m) long with a longest span of 14 ft (4.2 m).

Who owns IRR - US 191 over West Alkali Creek?

It is owned by the State Highway Agency.