US Bridges

10th LN over Bench South Canal 048

Fair

Cascade County, Montana · 10M E Fairfield · Structure no. L07023000+05001

Built
1984
41 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
30 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

10th LN over Bench South Canal 048 is a wood or timber stringer/multi-beam or girder carrying 10th LN over Bench South Canal 048 in Cascade County, Montana. It was built in 1984, so it is 41 years old, younger 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.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 30 ft (9.1 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries10th LN
CrossesBench South Canal 048
Location10M E Fairfield
RouteCounty Highway 7023
StateMontana
Coordinates47.60278, -111.77381
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating39.9 US tons
Inventory rating30 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span14 ft (4.3 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.4 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 10th LN over Bench South Canal 048 built?

It was built in 1984, making it 41 years old in 2025.

What condition is 10th LN over Bench South Canal 048 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 January 2025.

How much traffic does 10th LN over Bench South Canal 048 carry?

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

How long is 10th LN over Bench South Canal 048?

The structure is 30 ft (9.1 m) long with a longest span of 14 ft (4.3 m) and a deck 25 ft wide.

Who owns 10th LN over Bench South Canal 048?

It is owned by the County Highway Agency.