Spent a few years in the Harker Heights area serving in the Army at Ft. Hood! Wasn't really into Crappie fishing back then was more of a Largemouth and Wiper fisherman. Belton and Stillhouse reservoirs are both quality fishing for said species. I would look at Texas Game and Parks site as they list fish stocking and individual lake records for different fish on there and can give big clues towards were to start out.