I took this out-and-back hike in August 2022. It was a 9.3 mile hike one way. You start in relatively populated national forest land and then as you rise through the mountains, reach the Wilderness area. The trail climbs through Bear Basin, switch backing up the bowl of the basin to the first pass, which is stunning. The descent down the pass is rough with lots of steep gravel. The trail splits and you take the high trail to the east, over the next pass to Summit Lake, which is nestled between two mountains, then over the lass tiny pass and down into the last, big basin. Hike along the meadow until you reach Thompson Lake at the foot of Gallatin peak. You can summit the peak, but I didn’t. I surely didn’t see a reasonable trail up it!

Elevation

Trail on quad chart

Looking into Bear Basin Looking into Bear Basin

Wildflowers Wildflowers

Looking down into Bear Basin from the pass Looking down into Bear Basin from the pass

Summit Lake Summit Lake

Towards Thompson Lake Towards Thompson Lake

Thompson Lake Thompson Lake

Sunrise at Thompson Lake Sunrise at Thompson Lake