RedEyedbeauty... This site may have some answers for you.
http://www.tennessee.gov/environment/dws/newdam.shtmlI to am in TN and I also have a "blue line stream" running on my properyt plot map but, I already have a pond dam holding a wet weather swamp at this piont on the property. I believe that as long as it's for agricultural useage you should be fine. Here is a snippet of that web site that I found.
Certain classes of dams are exempt from regulation under the Safe Dams Act. The main exemption is for "farm ponds". Farm ponds are defined in the regulations as "...any impoundment used only for providing water for agriculture and domestic purposes such as livestock and poultry watering, irrigation of crops, recreation, and conservation, for the owner or occupant of the farm, his family, and invited guests, but does not include any impoundment for which the water, or privileges or products of the water, are available to the general public." A farm pond is exempt from the Safe Dams Act, but may NOT be exempt from other permitting requirements such as ARAP, etc.
Where my pond will become questionable is the location of the fencing. I will be placing a fence around the pond to keep the cattle OUT but, in the case of needing emergency water for the cattle I will be able to open a gate and they will have needed water.
