My paternal Grandmother's John PIEHL owned land there [see BLM] and my Uncle Erwin DeVere BLOTE was born there. I recently found a great map for "Winsor Township - 1897 Brookings County South Dakota" at rootsweb posted by Lori Krie awa 1901 (sorry don't have link).
It contains Sch. No. 16; McCabe Sch. No. 17 near Lake Mitchell, and O'Connor Scho. No. 18, , Pleasant Valley Sch. No 19.
You may also find a good description available from the Census subscription>SD>Brookings>Winsor and checking district boundaries.