But in 1861, the worst floods in state history turned the Willamette Valley into one giant half-million-acre lake and swept several burgeoning towns away. And, despite our flood-control dams, someday it will probably happen again. (Willamette Valley; 1860s, 1890s) (For text and pictures, see https://offbeatoregon.com/1704c.willamette-floods-1894-1861-439.html)