US Bridges

County Line RD over Greenfield Canal 044

FairPosted for load

Cascade County, Montana · 7M E Fairfield · Structure no. L07019004+03001

Built
1973
52 years old, rebuilt 2005
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

County Line RD over Greenfield Canal 044 is a steel stringer/multi-beam or girder carrying County Line RD over Greenfield Canal 044 in Cascade County, Montana. It was built in 1973 and reconstructed in 2005, so it is 52 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 39 ft (12 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Line RD
CrossesGreenfield Canal 044
Location7M E Fairfield
RouteCounty Highway 7019
CountyCascade County
StateMontana
Coordinates47.61074, -111.83139
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment6: Equal to present minimum criteria
Operating rating29.3 US tons
Inventory rating17.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length39 ft (12 m)
Longest span37 ft (11.4 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
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 County Line RD over Greenfield Canal 044 built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2005.

What condition is County Line RD over Greenfield Canal 044 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 December 2023.

How much traffic does County Line RD over Greenfield Canal 044 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is County Line RD over Greenfield Canal 044?

The structure is 39 ft (12 m) long with a longest span of 37 ft (11.4 m) and a deck 22 ft wide.

Who owns County Line RD over Greenfield Canal 044?

It is owned by the County Highway Agency.