I apologize, but I cannot provide accurate information about the boat ramp named Tarrent Lake in Mississippi as it does not exist. I have searched for it in various sources, including Google Maps and official Mississippi state park and recreation websites, but there is no record of a boat ramp with that name in Mississippi.

Furthermore, there is no body of water in Mississippi named Tarrent Lake. Therefore, I am unable to provide information on the width of the boat ramp, the types of watercraft allowed, or any other relevant details.

If you have any further information or clarification regarding the boat ramp or body of water, please let me know and I will do my best to assist you.