I met a family of kids and we found a summit geocache and all signed the first-to-find log book. Then the exposed summit turned surprisingly cold and windy and before I knew it everyone was gone and I had the top to myself.
Climbing back down I returned to the saddle and continued over the divide and down the Hell Roaring Creek drainage. First on a very pretty trail toward Mt Jefferson and Marie Lake and then cross-country down the rocky drainage then along the Hell Roaring Creek. At the head of the drainage is the most remote source of the entire Missouri/Mississippi river system. I was surprised to find it marked with a cairn and a log book.
Staying above the creek it was a nice bushwhack through grassy hills and wildflowers and occasional willow thickets and at the end some beaver flooded wetlands and water crossings. A very very nice day of hiking today. Camping just after Lillian Lake.