Kris wrote:I really want access to the whole park, but want to avoid high season onslaught of vacationing families and heat in June/July/August. Thanks.
I love September for all access. You do not have the heavy water flow, but the lack of bugs, people, and easier availibility of permits make it attractive.
One especially wonderful thing that is unique to the lower water flow is sliding down the cascade that is in front of Moraine Dome and the one from Lost Valley into Echo Valley. Both are natural waterslides, smooth granite into a deep pool with a great view to cap it off.
*Of course use caution and comon sense, you are in the wilderness without an easy evac route.*