Aeromagnetic map of the Peekskill quadrangle, Rockland, Orange, Putnam, and Westchester Counties, New York Lake Peekskill Dam is located on an unnamed tributary of Peekskill Hollow Brook and is 2-1/2 miles northeast of Peekskill, New York. Lake Peekskill is used... GE Andreasen,JL Vargo ...