"The Spirits of the Lake" by Alonzo Deen Cole, Weird Tales, November 1941

This one, which I presume has lapsed into the public domain, is courtesy of http://thepulpreader.blogspot.com/2010_01_01_archive.html. 

This story was originally presented on January 2, 1933, as an episode of the radio program "The Witch's Tale."