It happened around noon on the 200 block of Fredericksville Road in Rockland Township.
49-year-old Robert Hipp says he found the three-foot long animal in his fish pond.
With the help of his children, Hipp caught the gator and placed it into a box.
Police later arrived and transported the gator - named Little Rocky - to their barracks in Reading.
Authorities plan to contact the Lehigh Valley Zoo about taking possession of the alligator.
