Should have stated that it is located in Novesta Township, MI. not Evergreen.

That would/could also work. Though I am not sure much evaporation happens from these basins. These serve the same purpose as a slurry storage tank but earthen in nature almost always lined with clay to stop seepage. See here: building=slurry_tank
I'm just a new mapper trying to figure out how to tag these types of land uses, though I have been around cattle my whole life.

here is another manure storage are. way/1300252959 What are thoughts on using water=wastewater + content=slurry?

I see that you have tagged this way/1165881593 as a water basin. This a manure storage lagoon and as such I think it should be labeled differently. My thought would be water=wastewater + contents=slurry

Also added some water bodies near near Caspie Drain.

Ok thanks MapSpot & mapman44. I just discovered OpenStreetMap a few weeks ago looking for a way to create a personal map for myself & was intrigued with the concept. I did not find the Wiki until a week or 2 later. I will try to remove "private" from the driveways I added.