Diverting water around the beach sounds like a good idea to prevent rain from washing additional water down the beach area. Below is a link to a youtube video of the lake as well as some images to show additional detail. Once the lake is full, I will have about 20' of beach above the water line and another 20-30' below. My dock will extend into the water with one side on the shallow "beach" side and the other will be deep. I will see if we can dig out some additional dirt closer to the beach to get it deeper. It sounds like even a berm won't make that much difference. I could try to bring in some rip rap to build the berm with instead of using clay. I don't know if I could get river rock. I will dam the top side of the beach to route water around the beach area. I'm guessing I'll be losing sand regardless. Also note that this project ended late fall and I have not yet been able to stabilize the soil around the lake by planting grass. Any other ideas are welcome!

YouTube Video of Lake!


Both beaches
[Linked Image from i.imgur.com]

Beach 1 (see blue dashes to indicate berm placement); Also see "L" shape drawing for future dock placement.
[Linked Image from i.imgur.com]

Beach 1 (different angle)

[Linked Image from i.imgur.com]

Beach 2
[Linked Image from i.imgur.com]

Beach 2 (different angle)
[Linked Image from i.imgur.com]

Here is an image showing an inlet to the lake from a road tile. This runoff is strictly from 20 acres of wooded field and not farm ground.

[Linked Image from i.imgur.com]

Additional image showing an inlet to the lake.
[Linked Image from i.imgur.com]