US Bridges

Foothill Road over Mission Res Inlet 043

Good

Lake County, Montana · 6 M SE ST Ignatius · Structure no. 000000202303281

Built
2023
2 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Foothill Road over Mission Res Inlet 043 is a steel stringer/multi-beam or girder carrying Foothill Road over Mission Res Inlet 043 in Lake 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 40 ft (12.2 m) long and 21 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFoothill Road
CrossesMission Res Inlet 043
Location6 M SE ST Ignatius
RouteCounty Highway 24406
CountyLake County
StateMontana
Coordinates47.28961, -114.03303
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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19 US tons
Inventory rating14.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span38 ft (11.5 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Foothill Road over Mission Res Inlet 043 built?

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

What condition is Foothill Road over Mission Res Inlet 043 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 2023.

How much traffic does Foothill Road over Mission Res Inlet 043 carry?

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

How long is Foothill Road over Mission Res Inlet 043?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.5 m) and a deck 21 ft wide.

Who owns Foothill Road over Mission Res Inlet 043?

It is owned by the County Highway Agency.