The Wellsville Dam is now a Community Fishery.  You will still need a fishing license, but you can now fish year round.   The DWR (Division of Wildlife Services) will no longer be stocking the fishery just once a year. Under the Community Fishery program the dam will now be stocked periodically throughout the year. The dam will now be patrolled by the DWR. You can find out more about community fisheries here:

Fishing Rules and Regulations