Riverside is an

unincorporated community An unincorporated area is a parcel of land that is not governed by a local general-purpose municipal corporation. (At p. 178.) They may be governed or serviced by an encompassing unit (such as a county) or another branch of the state (such as th ...

in Ravalli County,

Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...

, United States. It sits at an elevation of 3,517 feet.> A post office operated in Riverside for a short time: it was established on January 16, 1889 and closed on May 28, 1895. The community once possessed a railroad station, which is no longer in existence; at various times, it was known as Riverside, Haggin, or River Siding.(dead link)

References

Unincorporated communities in Ravalli County, Montana Unincorporated communities in Montana {{RavalliCountyMT-geo-stub