US Bridges

S 360 FH 65 over Smith River

Fair

Meagher County, Montana · 2M E Fort Logan · Structure no. S00360016+05671

Built
1975
50 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
154 ft
2 main spans
Daily traffic
130
2023 count
Owner
State
State Highway Agency

About this bridge

S 360 FH 65 over Smith River is a prestressed concrete stringer/multi-beam or girder carrying S 360 FH 65 over Smith River in Meagher County, Montana. It was built in 1975, so it is 50 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 5 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 130 vehicles a day, roughly 9% of them trucks, projected to reach 137 by 2043. The structure is 154 ft (46.9 m) long and 35 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesS 360 FH 65
CrossesSmith River
Location2M E Fort Logan
RouteState Highway 360
CountyMeagher County
StateMontana
Coordinates46.67559, -111.14304
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
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 alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span76 ft (23.2 m)
Deck width35 ft (10.6 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (2023)
Projected traffic137 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was S 360 FH 65 over Smith River built?

It was built in 1975, making it 50 years old in 2025.

What condition is S 360 FH 65 over Smith River 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 August 2023.

How much traffic does S 360 FH 65 over Smith River carry?

About 130 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is S 360 FH 65 over Smith River?

The structure is 154 ft (46.9 m) long with a longest span of 76 ft (23.2 m) and a deck 35 ft wide.

Who owns S 360 FH 65 over Smith River?

It is owned by the State Highway Agency.