The public comment period only lasts through January 31, 2012.
All comments will be considered so this is the best chance to have a real impact on the flows from Glen Canyon Dam.
The link provided goes to American Whitewater. It has a great synopsis of the situation and will allow you to form your own opinion that you can post. Read the information (it's short). Make your voice be heard. Our influence can help make sure that the water that flows through the Grand Canyon will be varied enough to support the life in the canyon.