US Bridges

Main ST S over Sandstone Creek

Fair

Fallon County, Montana · South Plevna · Structure no. S00494000+03001

Built
1964
61 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
133 ft
2 main spans
Daily traffic
119
2023 count
Owner
State
State Highway Agency

About this bridge

Main ST S over Sandstone Creek is a prestressed concrete stringer/multi-beam or girder carrying Main ST S over Sandstone Creek in Fallon County, Montana. It was built in 1964, so it is 61 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 119 vehicles a day, roughly 1% of them trucks, projected to reach 125 by 2043. The structure is 133 ft (40.4 m) long and 31 ft wide. If it were closed, the detour would be 52.8 mi (85 km).

Location

Open in Google Maps
CarriesMain ST S
CrossesSandstone Creek
LocationSouth Plevna
RouteState Highway 494
CountyFallon County
StateMontana
Coordinates46.4105, -104.51761
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length133 ft (40.4 m)
Longest span66 ft (20.1 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic119 (2023)
Projected traffic125 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.8 mi (85 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 Main ST S over Sandstone Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Main ST S over Sandstone Creek 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 October 2024.

How much traffic does Main ST S over Sandstone Creek carry?

About 119 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Main ST S over Sandstone Creek?

The structure is 133 ft (40.4 m) long with a longest span of 66 ft (20.1 m) and a deck 31 ft wide.

Who owns Main ST S over Sandstone Creek?

It is owned by the State Highway Agency.