Thanks for all the replies.
We'll be going up MR and down JMT, in the second week of September. Is there anywhere along the MR that would be dodgy? For instance people camp at Iceberg Lake and Lower Boyscout Lake. We have 2 liter Camelbaks and I don't want to take more water than that.
Is there any obvious way to recognize the spring at the 23rd switchback on the descent?
K
