Dirt guys around Breckenridge charge from $2.50-4.00 per cubic yard to move dirt, however most prefer to bid the job. I've seen small "stock tanks" cost as little as $4,000 and some are more because of the site. Each pond stands on its own merit, based on site, watershed size, proximity to good clay and the type of equipment. Check with the Natural Resources Conservation Service in Breckenridge. I bet they have a list of pond builders there.