Native to Brazil, the Elodea infestation in Black Lake isn't as bad as it was a few years ago, but it still isn't good. "It's fairly substantial," said Jeff Nesbit, director of the Pacific County's Vegetation Management department.
And really, despite the introduction of sterile grass carp in the late 90's and some herbicide applications (more on that below), nothing has significantly changed the lake's Elodea population. And that may just be the way it stays; a family owned cranberry farm located to one side of the lake hold water rights and use the lake to fill their cranberry bogs at harvest time. This limits herbicide applications to mostly post-harvest time periods; as 3 applications a season (which would be ideal) are not ideal for cranberry farming.
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*"Egeria densa iceland" by Lara Gudmundsdottir - Own work. Licensed under CC BY-SA 4.0 via Commons https://commons.wikimedia.org/wiki/File:Egeria_densa_iceland.JPG#/media/File:Egeria_densa_iceland.JPG