Wikipedia contributors. (2024, September 13). Simon Schwendener. In Wikipedia, The Free Encyclopedia. Retrieved September 26, 2024, from https://en.wikipedia.org/w/index.php?title=Simon_Schwendener&oldid=1245494973
The mounds were once part of a larger stretch of a prairie ecosystem encompassing approximately 180,000 acres (73,000 ha), spanning from present-day Joint Base Lewis–McChord through Chehalis and into Oakville.