One river that feeds Hungry Horse Lake is known as Emerald River. It pours into the lake from a high cliff, forming a set of falls. However, Emerald Falls is farther upstream than the falls running into the lake, and it is much more beautiful than the lake falls. The falls pours down from a cliff in a vertical line that looks smooth and perfectly straight. Rainbows glance off of the falling waters. The rocks at the base of the falls are the result of past rockfalls that occur as the water eats away at the rock. Occasionally the rocks fall without warning to crush anything beneath them. Those that fell years ago are covered in moss and sit as if they belong there. There is no telling what lies beneath them now; they are too large to move.