With that size BOW and covering that large of watershed I would imagine the Corps of Engineers will want to have a say in it and they will have their own requirements and will probably want to be smack dab in the middle of your plans.
I know I'm not giving you the answer you wanted, but in Kansas once you get past a certain surface water area, water holding capacity and drainage area, there suddenly gets to be a lot more agencies interested in your project than your local NRCS guy.
Maybe a warning as much as helpful information.
