Be smart about this find, you'll need either a boat in the summer, or ensure that the ice is safe in the winter. This lake is kind of weedy, so be careful. The only legal way in that I know of is to use the boat launch, see the parking coordinates.
Please note - this cache is in a potentially dangerous location and seeking it is done at your own risk! There is no such thing as safe ice in the winter. Legal entry points (PWAs) are provided, other entry points may be considered trespassing on private property. The terrain rating reflects the need to travel on water.