Environmental legacies of lumber mill operations in Callander Bay, Lake Nipissing

Abstract

Lumbering activities, on Callander Bay of Lake Nipissing, Ontario, were revisited to explore how legacies from its once ‘frontier industry’ could be implicated in its cyanobacterial Harmful Algal Blooms (cHABs). Since ~1930, cyanobacteria have bloomed with increasing prevalence in Callander’s freshwater embayment, with 10 blooms reported from 2011-2024. Bridging water quality science with local history, this interdisciplinary study chronicles events of industrial mill operations on Callander Bay (1880s-present) as potential precursors to modern cHABs. Analysis of archival content revealed history of an environment highly affected by lumber mills which processed hundred-millions of board feet per year. Past mill operations with their supportive industries of navigable steamships and locomotion were Callander’s prominent economic drivers at local to national scales – where soot-laden smoke once signalled opening Ontario’s North. Despite being outward symbols of momentum, Callander’s mills had largely closed by 1968 but continued into the 2000s. Subsequently, the lumbering era, which had brought economic prosperity, left behind contamination, degradation, and cultural heritage artifacts within the Callander Bay watershed.