I have fished Withy many times. I would describe it as a pond as it is in the middle of farm land and is only 10 acres. It has been many years since I've visited and last time I was nearby, it appeared the access was no longer open to the public. Please correct this if inaccurate
As far as fishing is concerned, it is subject to challenging conditions if there's much of a wind blowing as there are only low-lying fields which provide little protection. There is a population of smallish bluegill and brown bullhead as well as a few largemouth which are just as small. The only reason my buddy and I used to fish it is that it's shallow and warmed prior to other warm-water lakes and ponds.
It is definitely not the Donkey Pond which is private and well-patrolled by some very large , local owners.
Withy isn't really worth the effort even if it was open and couldn't stand up to pressure if it was and the location well known.
Best to all.
Michael