By the way, that wooden thing you see in the pictures is where I blocked the culvert and am going to put a tiny dock. This way I'll be able to get in and out of the water for swimming without disturbing too much muck and geting myself all full of it.
Just to the right of it you can see my new spillway which has the waterline running up it from the itsy-bitsy lower pool (where I have the water pump).