I did one about 3 or 4 years ago for a Live stock pond with NRCS. They pay so much per yard of dirt. If you ask me its a joke. Because you have to build the pond to there requirements but they are only going to pay for a percentage of the cost. When it was all said and done I wish that I would've just payed for it 100% myself. Id bet that it would've cost me the same. But the NRCS will help you lay out a pond and give you an idea of what kinds of soil you have at different depths free of charge.
This is the same experience I have had when trying to do government "cost share" programs. I wanted to build a litter (manure for poultry) shed once but the state engineers wanted to build a Wal-Mart building, with all the specified bends just so in the concrete footings. I ended up just doing what I wanted on my own. It was just going to end up being a big boondogle at the taxpayers expense, so I skipped it. Have not ever applied for cost share again. Use their free services though as our NRCS guy is a stand up guy (shed was a different agency, not NRCS).