Part I: The Topographical and Economic Crucible of the Pee Dee

Situated at coordinates 33°52′25.59″N 79°25′34.20″W within the modern boundaries of Florence County, South Carolina, Poston occupies a low-lying coastal plain environment characterized by an elevation of merely 69 feet above sea level.² Long before the advent of rail lines, paved highways, or modern supply chains, this terrain was utterly dominated by the Great Pee Dee River. This massive, free-flowing waterway served as the primary logistical artery for indigenous Siouan populations (such as the Cheraw), colonial European traders, and the antebellum planters who would eventually colonize the region.² The geography of the Great Pee Dee is characterized by diverse scenery along winding water trails, lined by dense swamps, bottomland hardwood forests, and coastal marshes that provided both exceptional agricultural fertility and severe logistical challenges.⁵

The Era of "Ellison" and the River Port Economy

Prior to the twentieth century and the adoption of the Poston name, the geographic locale currently recognized as Poston was originally known as "Ellison".¹ During the eighteenth and nineteenth centuries, Ellison functioned as a vital, highly active river port on the Great Pee Dee.¹ The physical infrastructure of this era relied heavily on specialized, strategically located landings that facilitated the loading and offloading of agricultural commodities, commercial goods, and human capital.

Among the most historically significant of these logistical nodes was Allison Landing—alternatively documented in various historical records and county maintenance agreements as Ellison's Landing or Poston Landing.⁷ The strategic importance of this specific riverine geography predates the region's commercial boom. Allison Landing is situated approximately three miles upriver from the Port's Ferry site, a critical river crossing famously utilized by General Francis

Marion—the "Swamp Fox"—during his 1780 guerilla campaigns against British and Loyalist forces during the American Revolution.⁷ The presence of such landings, combined with the natural defensive capabilities of the surrounding swamps, allowed the Ellison settlement to mature into an agrarian logistical hub long before formal municipal incorporation.

By the 1820s, the introduction of steamboats revolutionized the economic capacity of the Great Pee Dee River, transforming it from a slow, current-dependent thoroughfare into a two-way engine of commerce.⁶ Pioneers of steam navigation, such as Captain Moses Rogers—who had previously commanded the Savannah, the first steamship to cross the Atlantic—were hired to command vessels like the 6 Great Pee Dee . These steamboats drastically reduced the transit time for goods moving between the inland plantations surrounding Ellison and the coastal port of Georgetown.⁶ In 1822, for example, the Great Pee Dee could make the round trip to Georgetown in just four days and six hours, an unprecedented velocity for regional trade.⁶

The Vulnerabilities of Riverine Commerce

Despite the advancements in steam technology, the river port economy of Ellison was inherently fragile. The primary commodity driving this river economy was, unequivocally, cotton.¹⁰ Grown in the fertile floodplains and processed in local gins, cotton was routinely transported downstream to coastal markets. However, the river was treacherous, characterized by hidden snags, shifting sandbars, and unpredictable seasonal flooding.

Historical records highlight the financial risks associated with this dependency. In March 1822, the Pee Dee Steam Boat Company recorded a massive loss of $2,277.¹⁹ due to 69 bales of cotton being severely damaged when their tow boat sank in the river.¹⁰ Although

the company managed to recover a portion of the value by selling the damaged bales at auction, the incident underscores the precarious nature of the Ellison economy.¹⁰ The settlement thrived as a decentralized node in the broader Southern cotton economy, but its prosperity was entirely dependent on the seasonal and temperamental flows of the Great Pee Dee. It was this exact logistical vulnerability that would eventually pave the way for the region's railroad revolution.