Visit the Team Iceshanty Proshop
It would be a shame to drain Oyama since there's quite a few people who go there just to get out of town for a couple of days in summer. Without the lake the campground and golfcourse will be hard to sustain.
. I don't know how long it's been since you've been there but the golf course was shutdown years ago. The land is now owned privately by a local farmer who lets all his cows nuts and frolick on the far northern lip of the reservior.