Since this is a park and fishing spot please be aware of muggles and use stealth if necessary.
The cache is a bottle preform painted black.
This lake is also a good fishing spot.
From lake-link.com :
Parker Lake is located in Adams County, Wisconsin. This lake is 59 acres in size. It is 30 feet deep at its deepest point. Anglers can expect to catch a variety of fish including Bluegill, Brown Trout, Largemouth Bass, Northern Pike and Rainbow Trout.