I am not sure why the D.O. changes so rapidly during the spring thaw each year. I just know that is does and must have something to do with all the water flowing in and out of the pond at that time.
The times that I have checked the D.O. in the river and in the well have been during stable periods where the river is flowing but at "normal" levels. The river has been near saturation levels and the well is always in the 2.5+- range @ 50+- degrees.
