The eutrophication of Lake Champlain's northeastern arm: Insights from paleolimnological analyses

► Sediment cores indicate that northeast Lake Champlain was historically oligotrophic. ► Land clearing and agriculture in 19th century minimally affected trophic condition. ► Sewage discharge to St. Albans Bay led to its eutrophication in early 20th century. ► Missisquoi Bay's much later eutrophication is related to rising farm waste output. ► NE Lake Champlain continues to degrade despite elimination of P from point sources.