* Elk River is the home of the Idaho Champion Western Red Cedar Tree, the largest tree in the state. Estimated to be over 3000 years old this giant is more than 18 feet in diameter and stands 177 feet tall. | * Elk River is the home of the Idaho Champion Western Red Cedar Tree, the largest tree in the state. Estimated to be over 3000 years old this giant is more than 18 feet in diameter and stands 177 feet tall. |