This route is the easiest and least fun way to access the quarry, but it will get you there. Park in the end of the neighborhood on Waynescott Road and enter the woods to the left of the house with the American flag. There should be a trail to follow that will take you right to the water. You'll have to pass a "No Trespassing - Private Property" sign, but that's how you'll know you're going the right way.

Park at the Ridgewood Baptist church at 2720 Lilly Road and enter the woods near the "No Trespassing - Private Property" signs. If you weave through the woods, you should find a trail that will take you to the upper ridge of the quarry. You can walk the entire distance around the lake (1 mile) on this path and there are a few treacherous routes from the rim down to the water if you want to go in. This route is by far the hardest and longest way to get to the water - courtesy of the boys' cross country team circa 2014.

There's usually no one patrolling this site, but sometimes they pay a teenage guy in a kayak to sit in the middle and yell at trespassers. Every person I've encountered is pretty friendly and will let you off the hook if you just apologize for being at the site and promising to leave. You won't get in any trouble unless you're bringing in illegal substances.

Have you been to this site? What did you think? Leave any tips of your own or observations in the comments to help other explorers!

The coordinates of the actual site are 43.137675, -88.206257, which you can plug into Google maps.
Park at NAPA Auto Parts or Sussex Inn in Sussex (hence the name "sexy" or "sussexy" quarry) and walk down the Bugline trail (otherwise known as the sidewalk on Waukesha Avenue). You'll pass underneath a train bridge. Follow any trail through the woods, but the easiest access is ironically right by the "No Trespassing" sign. Before you turn in, make sure there aren't any other walkers that will notice your venture into the wilderness. Once in the tall grass, walk straight. You'll pass over some train tracks. Keep walking. There should be a narrow trail to follow. If you keep going, to the left of the electricity poles should be the quarry. Good luck!