600 acres is close to being a lake. I would think it is large enough to handle crappie. My friend has a 15 acre lake that is 6 years old and we have gotten several nice messes of 10-13" crappie as well as some 3 -5# bass.
Just don't let any white perch get in there. Hard to prevent if other lakes have them. Wading birds will carry eggs from one body of water to another.