Derek, NRCS money assistance on ponds is hit or miss county by county here in Missouri. However they should still come out and do a layout for you. If I were you I would call the NRCS regional office in your area and request they send someone out to do a pond evaluation for you. I know that in Missouri even the NRCS counties that do not offer money assistance on ponds will still do a pond layout for you.
As for the cost of building the pond from some of the size and depth numbers you stated. I would guess cost to be around $22,500 for a 1 acre pond. Depending on the distance that you need to move the dirt from the pond, that price may or may not include that. If you could get someone to do a cross section of the field that would be a big plus.
I think it would be wise to spend some money if you can't get the NRCS to help to have the pond designed by a professional and come up with some hard numbers. Then you would have a good yardage number to take to all the contractors.
