Mr Kim just wanted to welcome aboard another TX hay farmer. Great first post.
I'm sure you get your soil tested for your hay, so any applications like lime that you need to balance your pasture PH will be needed in the pond also. It might be a good time to do that testing now before the pond fills up.
Also, you probably will get aquatic weeds if you leave the upper end shallow. Searching the archives may help you find some more desirable plants, but be forewarned because the water fluctuation will affect those also. I've lost arrowhead, hardy lilies, eel grass, etc. to water level drops.
Good luck, and keep the updates coming.
