US Bridges

Carney Lane over Parrot Ditch

Good

Madison County, Montana · 1M E Waterloo · Structure no. 000000202408085

Built
2023
2 years old
Condition
Good
inspected March 2024
Type
Culvert
Concrete
Length
22 ft
1 main span
Daily traffic
154
2023 count
Owner
County
County Highway Agency

About this bridge

Carney Lane over Parrot Ditch is a concrete culvert carrying Carney Lane over Parrot Ditch in Madison County, Montana. It was built in 2023, so it is 2 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 154 vehicles a day, roughly 3% of them trucks, projected to reach 165 by 2043. The structure is 22 ft (6.8 m) long.

Location

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CarriesCarney Lane
CrossesParrot Ditch
Location1M E Waterloo
RouteCounty Highway 29015
CountyMadison County
StateMontana
Coordinates45.72152, -112.17027
Functional classRural Local

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 inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating46.4 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length22 ft (6.8 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic154 (2023)
Projected traffic165 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Carney Lane over Parrot Ditch built?

It was built in 2023, making it 2 years old in 2025.

What condition is Carney Lane over Parrot Ditch 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 March 2024.

How much traffic does Carney Lane over Parrot Ditch carry?

About 154 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Carney Lane over Parrot Ditch?

The structure is 22 ft (6.8 m) long with a longest span of 20 ft (6.1 m).

Who owns Carney Lane over Parrot Ditch?

It is owned by the County Highway Agency.