Question: Jackson, Montana is south of what small town in Beaverhead County?

Context paragraphs:
Beaverhead County High School: Beaverhead County High School is a high school in the small town of Dillon, Beaverhead County, Montana.

Bannack, Montana: Bannack is a ghost town in Beaverhead County, Montana, United States, located on Grasshopper Creek, approximately 11 mi upstream from where Grasshopper Creek joins with the Beaverhead River south of Dillon.  Founded in 1862, the town contemporarily operates as a National Historic Landmark and is managed by the state of Montana as Bannack State Park.

Armstead, Montana: Armstead is a former community in Beaverhead County, Montana, United States, about 21 mi south of the county seat of Dillon.  It was named after miner Harry Armstead.  Armstead was located in a narrow valley of the Beaverhead River, near the mouth of Horse Prairie Creek.  The town was a station stop on the Union Pacific Railroad line from Idaho Falls, Idaho to Butte, Montana.  There was a post office in Armstead from 1907 to 1962.

Red Rock Pass (Beaverhead County, Montana): Red Rock Pass, el.  7152 ft is a mountain pass in Beaverhead County, Montana.  The pass lies on the Continental Divide just north of the eastern Centennial Mountains.  It separates Beaverhead County, Montana (west) from Fremont County, Idaho (east).  The pass is traversed by an unimproved gravel road.

Beaverhead Mountains: The Beaverhead Mountains, highest point Scott Peak, el.  11393 ft , are a mountain range straddling the Continental Divide in the U.S. states of Montana and Idaho.  (See also the GNIS link here.)  They are a sub-range of the Bitterroot Range, and divide Beaverhead County, Montana from Lemhi County, Idaho and Clark County, Idaho.

Jackson, Montana: Jackson is an unincorporated community in Beaverhead County, Montana, United States.  Although it is unincorporated, Jackson has a post office with a ZIP code of 59736.  Jackson lies on Montana Secondary Highway 278 south of Wisdom and northwest of Dillon.

Clark Canyon Dam: Clark Canyon Dam is an earthfill dam located in Beaverhead County, Montana, about 20 miles (30 km) south of the county seat of Dillon.  The dam impounds the waters of the Beaverhead River, creating a body of water known as Clark Canyon Reservoir.  The structure was constructed in 1961-1964 by the United States Bureau of Reclamation, to hold water for downstream irrigation and for flood-control purposes.

Tendoy Mountains: The Tendoy Mountains are a small mountain range northwest of Lima in Beaverhead County in the U.S. state of Montana.  The mountains are a subrange of the Beaverhead Mountains, part of the Bitterroot Range.  The highest point in the range is Dixon Mountain at 9674 ft .  The Bureau of Land Management (BLM) and

Beaverslide: A beaverslide is a device for stacking hay made of wooden poles and planks that builds haystacks of loose, unbaled hay stored outdoors to be used as fodder for livestock.  The beaverslide consists of a frame supporting an inclined plane up which a load of hay is pushed to a height of about 30 ft , before dropping through a large gap.  The resulting loaf-shaped haystacks can be up to 30 feet high, can weigh up to 20 tons, and can theoretically last up to five or six years.  It was invented in the early 1900s and was first called the Beaverhead County Slide Stacker after its place of origin, the Big Hole Valley in Beaverhead County, Montana.  The name was quickly shortened to "beaverslide."

Wisdom, Montana: Wisdom is a small town in Beaverhead County, Montana, United States.  The population was 98 at the 2010 census.  The ZIP Code of the area is 59761.  The town includes three tourist lodgings, service station, grocery, school (K-8), post office and a Forestry Service office.  It is also included within the boundaries of the Wisdom, Montana, Census Designated Place, which is named after the town.

Supporting paragraphs: Jackson, Montana Wisdom, Montana
Answer: Wisdom