It is a Catholic Church with mass held every day. It is a large complex with a wall around the whole thing. We were able to enter the church and the altar is pictured here. It was dismantled from the St. Joseph Hospital in Omaha in 1980. The statue in front is waiting to be installed.
This church is literally out in the middle of nowhere. There were a few cars around when we pulled in, and another car followed us into the parking area, but it seemed deserted, and rather mysterious. I have tried an internet search, but cannot find anything about it. We speculated that it may be a retreat center.
We didn't find the lake.