The following data is extracted from History of the Pacific Northwest, Oregon and Washington, 1889.
CLARK FERGUSON. - This gentleman was born in Putnam county, New York, October 13, 1835, and lived at his birthplace until the age of twenty. In April, 1855, he came with his brother Yates via the Nicaragua route to the land of gold, arriving in San Francisco in May. After two years of life in California, he returned to his Eastern home, but one year later again came west via the overland route. On reaching Fort Leavenworth, Kansas, and receiving the intelligence of the Mormon troubles, he located in that place, remaining two years. He then came to the mines of Pike's Peak, but not being very successful in his operations, entered the government employment as wagon-master on trains billed to New Mexico, continuing in that service three years. After a time spent in the mines of Idaho, he came to Washington Territory and joined his brother, Honorable E.C. Ferguson, at Snohomish, and makes that flourishing city his home, owning a large amount of valuable real estate adjoining.
Source: History of the Pacific Northwest, Oregon and Washington, 1889