I just returned from a 17-day solo.  Looped from Prairie Portage.  Stayed on Baird on Day 4, Camel on Day 5 and then headed south to Delahey on Day 6.  I saw a group of teens from Texas on Cairn, a husband/wife on the Cutty Creek just before getting to Camel and saw one tandem canoe heading north on Camel the morning I left Camel for Delahey.  Then, I did not see another paddler for 9 straight days.

The water levels on the Cutty creek mid-July appeared higher than previous posts from others the past year or two.  I had no problems at all.  I would also think in early September, you'd probably see less folks on your planned route than in the summer months.