Question: W.C. Child Ranch is south of a town in which Montana county?

Context paragraphs:
Montana County, Kansas Territory: Montana County was a county of the United States Territory of Kansas that existed from February 2, 1859 to January 29, 1861, when Kansas joined the Union as a state.

W.C. Child Ranch: The W.C. Child Ranch also known as the Kleffner Ranch and the Child-Kleffner Ranch is a national historic site located on state highway 518, south of East Helena, Montana, United States.  It was added to the National Register of Historic Places on November 23, 1977.

Cross S Ranch Headquarters: The Cross S Ranch Headquarters is a historic building located in farmland 5 mi south of Olustee, Oklahoma.  The two-story stone building served as the headquarters of the Cross S Ranch, a cattle ranch founded in 1891.  As a major cattle trail passed through the area, the ranch took advantage of the open land to raise free-range cattle.  By 1902, the ranch had decreased in size due to homesteaders and raised horses rather than cattle.  The ranch eventually became a wheat farm, reflecting a broader shift in Jackson County agricultural production.  A larger wheat farm purchased the ranch in the 1970s, and the headquarters building is all that remains of the original property.

East Helena, Montana: East Helena is a town in Lewis and Clark County, Montana, about 5 mi east of downtown Helena.  The population was 1,984 at the 2010 census.  It is part of the Helena Micropolitan Statistical Area.

Cedarvale (Hillsboro, Montana): Cedarvale, also known as Hillsboro Ranch, was a dude ranch and working ranch in Carbon County, southern Montana, United States.  The ranch was established about 1903 by prospector Grosvener W. Barry on the South Fork Trail Creek.  Barry used the ranch as a home for his family and as a base for his mining ventures, all of which failed.  His most lucrative venture was the conversion of Cedarvale from a working ranch to a dude ranch, marketed through an arrangement with the Chicago, Burlington and Quincy Railroad.  It was the first dude ranch in the area.  Barry introduced powered boats to the Bighorn River to carry dudes to the ranch from the railhead at Kane, Wyoming.  As a publicity stunt Barry, his stepson and a neighbor piloted the 16 ft motorized "Edith" from the Hillsboro landing down the Bighorn, Yellowstone, Missouri and Mississippi rivers, leaving on May 31, 1913 and arriving in New Orleans on August 1.  One of Barry's boats, the "Hillmont", is on display at Barry's Landing.

Sod House Ranch: The Sod House Ranch is an historic ranch in Harney County in southeastern Oregon, United States.  The remaining ranch structures are located south of Malheur Lake in the Malheur National Wildlife Refuge.  The ranch was built by Peter French, a well known 19th-century cattle baron.  The Sod House Ranch became the headquarters for the northern operating division of the "French-Glenn Livestock Company", which eventually covered over 140000 acre .  After French was murdered in 1897, the French-Glenn Livestock Company slowly sold off its ranch property.  In 1935, the United States Government purchased the Sod House Ranch property to add to an adjacent wildlife refuge.  The eight remaining Sod House Ranch buildings are now listed on the National Register of Historic Places.

Spahn Ranch: Spahn Ranch, also known as the Spahn Movie Ranch, was a 500 acre movie ranch in Los Angeles County, California, used for filming generally Western-themed movies and television programs.  With mountainous terrain, boulder-strewn scenery, and an 'old Western town' set, Spahn Ranch was a versatile filming site for many scripts.  No longer in use, the entrance to the historic ranch was at 12000 Santa Susana Pass Road (street numbers have since been changed) of the Simi Hills and Santa Susana Mountains above Chatsworth, California.  Now part of the Santa Susana Pass State Historic Park, Spahn Ranch is notorious for having been the primary residence of Charles Manson and his followers, the "Manson Family," for much of 1968 and 1969.

Cozens Ranch House: The Cozens Ranch House in Fraser, Colorado was built by William Cozens, sheriff of Central City after he married Mary York.  Mary insisted that they leave the wild mining town, so the Cozens family relocated to Grand County, where they started a ranch in 1874.  The homestead was the first in the Fraser Valley.  The original ranch house was built of logs and expanded two years later as a stagecoach stop and post office.  Six rooms were used as a hotel.  At its height the ranch comprised 600 acre .  Mary Cozens willed the property to the Jesuits, who renamed the property "Maryvale" and use it as a retreat from the 1920s to the 1980s.  In 1990 the ranch was restored to its late 1800s condition by the Grand County Historical Association It is operated as a museum.

Cross Ranch Headquarters: Cross Ranch Headquarters is a historic ranch located east of Montana Highway 59 roughly 26 mi south of Broadus, Montana, USA.  Rancher Spencer Fullerton Baird Biddle built the headquarters in 1893, one year after purchasing the ranch.  A Philadelphia native, Biddle moved to Montana in 1881; he quickly became a prominent rancher, and by 1885 he was both an early member of the Montana Stockgrowers Association and a representative in Montana's territorial legislature.  At the time, ranchers were a powerful influence on state government, and Biddle's legislature passed several laws supported by the ranching industry.

M L Ranch: The M L Ranch was established by Henry Clay Lovell and his financial backer Anthony Mason in Wyoming's Big Horn Basin in the late 1870s to the south of the present location.  The second and final location was established farther north as a cattle line camp in 1883 to be closer to markets in Billings, Montana.  In 1884 it became the headquarters for a ranch that reached 25000 acre in area.  The bad winter of 1886–87 killed half the stock on the ranch, more than 10,000 head., but the M L fared better than most.  Mason died in 1892.  Lovell died in Oregon in 1903.  Lovell, Wyoming was named in his memory.  The Lovell family ran the ranch until 1909.  In the early 1960s the ranch was purchased by the Bureau of Reclamation as part of the Bighorn Lake reservoir project.  In 1966 the headquarters site was transferred to the National Park Service as part of Bighorn Canyon National Recreation Area.

Supporting paragraphs: W.C. Child Ranch East Helena, Montana
Answer: Lewis and Clark County