I'm not really sure how it would all react to a big rain. The main feeder creek to the lake is right next to this area. So I'm not sure if the lake would fill up before my plot, and equalize over the back of the levee or what. Or i may make a spilway aimed to the east toward the creek. The finger of trees is definitely the lowest part of the area. I think plugging the drainage would end up with a 6 ft deep low spot. But the average depth across the whole area would be more like 2 ft. My biggest fear is the soils ability to hold water. But if it's a good indication the spot on the 2nd pic that reads "okfuskee" usually is pretty damp. Also the terraces further west up the hill hold water for a good period of time. I've watched mallards fly by my dekes on the lake and land in those potholes! As far as draining goes. I'm not terrible worried about it. The average height of the lake would be below the drain pipe. Pulling the boards out should drain it right out. Also... I'm hoping this is a pretty easy project actually. My Grandma has dozer work done at least once a year anyway. I'm pretty sure the dozer guy could fill in gap in question in a few hours. So I could have then do that with a pipe. Put the flash board riser on. Then see what happens. Might be less then $1000 to try it.