Jack Main Canyon and Tilden Lake Professional Guide
Detailed Trail Description from our Guidebook
"This multiday loop hike has been included in the Hetch Hetchy section because it begins and ends there, but part of it extends into the remote north boundary country. Spring runoff in early season makes some sections of trail nearly impassible and many creek crossings extremely dangerous. On the other hand, if you wait too long, the beginning and end of the trip at the low elevations around Hetch Hetchy Reservoir can be hot and dry. Still, if the conditions are right, it’s a great hike, with solitude guaranteed. Just be sure to check with the park service about trail conditions before setting out."