re: How much to fill in an acre with dirt?

Call a local contractor around there that does excavation. Ask if he has a Long stick excavator, and how much he'd charge per week. Explain to him what you're wanting to do (deepen pond and stockpile the spoil next to it). From all the information you've provided so far, and assuming you won't have to go through a big wetland permit process, one operator and machine can do what you need in a week. Let him spread the spoil, let it dry, and in about 6 months you can hire a dozer to grade and compact it, while hauling in the needed fill to get where you want to be once you see the results.

I'd think you should be able to get that done for about 1K/day. It may only take him 3 days if you monitor and direct the job.