Mine Falls Park is a 325-acre park in the city of Nashua, New Hampshire, United States. Located in the heart of the city, it was purchased in 1969 from the Nashua, New Hampshire Foundation with city and federal Land and Water Conservation Fund money. It is bordered on the north by the Nashua River and on the south by the millpond and power canal syst…Mine Falls Park is a 325-acre park in the city of Nashua, New Hampshire, United States. Located in the heart of the city, it was purchased in 1969 from the Nashua, New Hampshire Foundation with city and federal Land and Water Conservation Fund money. It is bordered on the north by the Nashua River and on the south by the millpond and power canal system.