"The Henchman" writes:

I'm in Zone 5 and It's still one month if not 7 weeks maybe before I
open my pool.

In the mean time I've 4 months of snow water and ice that has melted
on the top of my closed pool. Tons of leaves and other organic
debris in the water. gallons upon gallons that starting to stink a
bit now. It's all sitting onto of a tarp that separates the winter
water from the pool water of last September.

What effects would there be if I pump this onto my lawn or save some
in barrels for the gardening season which can't begin in these parts
until May 1st? Can this tarp water cause issues?

If you get closer it stinks A LOT!

Just like a cesspool.

It's got to be good for lawns but I wouldn't save it, it stinks.

It's better to keep the water off the cover as best you can.
I have an electric siphon that I use when the water isn't frozen.
I don't direct the siphon on to the lawn, mainly because the
ground is already saturated.