While walking around the lake, we found what looked like an old stone foundation. There's not much more than that left. It seemed like there was room for a cache here.
You'll have to find your way here. There's no marked trail but there is occasional hiking through here. We came in from the gateway near the outlet of the lake. You'll be looking for a camouflaged wide-mouth plastic bottle in a hollow home. It's not necessarily winter-friendly.