









The high cliffs that make up the gates are natural formations that have been carved out of the rock by the Smoky River. The cliffs have risen up along with the rise of the Rocky Mountains. The Smoky River is powerful enough to carve out the rock as it rises. Over time, this process created high cliffs with the river below. The Sulphur River is not as powerful as the Smokey and it has taken an different path through the mountains. The paths of these two rivers meet immediately downstream of the gates.