Build your home on Lake Onderdonk! Two lots combined to make this the largest lot available for sale on the lake. Eleven acres with 103 feet of lake frontage give you the perfect combination of lake access and plenty of room for privacy and seclusion. Lake Onderdonk is a 64-acre man-made private lake located in the town of Westerlo in Albany County, New York. Meander through the woods or wander down to the water, whatever your pleasure, this is the spot for your lakefront dream.