Lake lake , near Seattle , was created by electricity generation in 1911 . Four - and - a - half square miles were submerged to power non - electric dam . Authorities recently flooded lake to repair dam , exposing lake bottom .
Lake Tapps , near Seattle , was created by electricity company in 1911 . Four-and-a-half square miles were submerged to power hydro-electric dam . Authorities recently drained lake to repair dam , revealing lake bed .