US Bridges

US 212 over Drainage

Fair

Carter County, Montana · 2M NW Alzada · Structure no. 000000202408079

Built
1965
60 years old
Condition
Fair
inspected March 2024
Type
Culvert
Steel
Length
24 ft
2 main spans
Daily traffic
2,642
2023 count
Owner
State
State Highway Agency

About this bridge

US 212 over Drainage is a steel culvert carrying US 212 over Drainage in Carter County, Montana. It was built in 1965, so it is 60 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 2,642 vehicles a day, roughly 30% of them trucks, projected to reach 2,959 by 2043. The structure is 24 ft (7.3 m) long and 37 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesUS 212
CrossesDrainage
Location2M NW Alzada
RouteU.S. Route 212
CountyCarter County
StateMontana
Coordinates45.042, -104.4403
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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span10 ft (3 m)
Deck width37 ft (11.3 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,642 (2023)
Projected traffic2,959 by 2043
Trucks30%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 212 over Drainage built?

It was built in 1965, making it 60 years old in 2025.

What condition is US 212 over Drainage 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 March 2024.

How much traffic does US 212 over Drainage carry?

About 2,642 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is US 212 over Drainage?

The structure is 24 ft (7.3 m) long with a longest span of 10 ft (3 m) and a deck 37 ft wide.

Who owns US 212 over Drainage?

It is owned by the State Highway Agency.