On January 5, 1916 heavy rain began—and grew gradually heavier day by day. Dry riverbeds filled to the point of flooding. Worsening floods destroyed bridges, marooned trains and cut phone cables - not to mention flooding homes and farms. Two dams, Sweetwater Dam and one at Lower Otay Lake, overflowed. Rain stopped on 20 January but resumed two days later. On January 27 Lower Otay Dam broke, increasing the devastation and reportedly causing about 20 deaths (accounts vary on the exact number).