US Bridges

7th LN over Mill Coulee Canal 093

Good

Cascade County, Montana · 7M E Fairfield · Structure no. L07008000+05001

Built
1950
75 years old
Condition
Good
inspected December 2024
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

7th LN over Mill Coulee Canal 093 is a wood or timber stringer/multi-beam or girder carrying 7th LN over Mill Coulee Canal 093 in Cascade County, Montana. It was built in 1950, so it is 75 years old, older 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 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 8.1 mi (13 km).

Carries7th LN
CrossesMill Coulee Canal 093
Location7M E Fairfield
RouteCounty Highway 7008
StateMontana
Coordinates47.60396, -111.83706
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
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 rating34 US tons
Inventory rating24 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span15 ft (4.7 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 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 closed8.1 mi (13 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 7th LN over Mill Coulee Canal 093 built?

It was built in 1950, making it 75 years old in 2025.

What condition is 7th LN over Mill Coulee Canal 093 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 December 2024.

How much traffic does 7th LN over Mill Coulee Canal 093 carry?

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

How long is 7th LN over Mill Coulee Canal 093?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.7 m) and a deck 25 ft wide.

Who owns 7th LN over Mill Coulee Canal 093?

It is owned by the County Highway Agency.