factors affecting water clarity MN

[DetectorGuy]

My folks used to have a cabin on the South East side of Long Lake Just North of Longville. I haven't dove there yet but I snorkeled the crap out of it when I was a kid. I remember the water being crystal clear and looking down from the boat outside the weedline seeing bottom at 20' There is a Spring on this lake near the penninsula and the rumor is that a car fell through the ice years ago over this spring.