US Bridges

Frontage Road 168 over Sep I 94 001

Fair

Prairie County, Montana · 2M SW Fallon · Structure no. L40168004+00001

Built
1969
56 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
337 ft
4 main spans
Daily traffic
100
2025 count
Owner
State
State Highway Agency

About this bridge

Frontage Road 168 over Sep I 94 001 is a steel continuous stringer/multi-beam or girder carrying Frontage Road 168 over Sep I 94 001 in Prairie County, Montana. It was built in 1969, so it is 56 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.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 337 ft (102.6 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFrontage Road 168
CrossesSep I 94 001
Location2M SW Fallon
RouteCounty Highway 40168
StateMontana
Coordinates46.81934, -105.17493
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.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28 US tons
Inventory rating20 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4 (+1 approach)
Design loadHS 15
Structure length337 ft (102.6 m)
Longest span95 ft (29 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.4 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
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Frontage Road 168 over Sep I 94 001 built?

It was built in 1969, making it 56 years old in 2025.

What condition is Frontage Road 168 over Sep I 94 001 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 July 2024.

How much traffic does Frontage Road 168 over Sep I 94 001 carry?

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

How long is Frontage Road 168 over Sep I 94 001?

The structure is 337 ft (102.6 m) long with a longest span of 95 ft (29 m) and a deck 30 ft wide.

Who owns Frontage Road 168 over Sep I 94 001?

It is owned by the State Highway Agency.