Indeed - and apparently the much redder hue of the RED River has never provoked such concern.
The Red River is red because the land it runs through is extremely reddish in color.
There would not be any concern over that, because it doesn’t signify a dying body of water that becomes discolored and putrid.
Whereas, the OC Fisher Lake per the article is red because of what is wrong with the lake, not because of the red land beneath it like the Red River.