Great question , and I don't know ! I found a house that was last on the map about 1930. It is located on what is now park land close to the lake . The house had poured walls celler , a cistern , 3 chimneys , it also had pipes coming through the celler wall . The pipes are a mystery to me , best I can remember 4 approx 1 or1/4 size together , maybe oil heat ? , I could not tell if the concrete cistern was for water or sewer, it was on the opposite side of the home . The celler had poured stairs rear entry . There was a huge poured garage foundation approx 25 / 40 . Also the home had reddish stucco , with wire , make sit hard to detect . The house is close to a main lakeshore rd that's has is one of the oldest routes along the lake . Very close by is a old camp that had cabins with gas , elect , and septic that disappeared in the 50's . The area is known for health ,summer , recreation camps , one of the first YMCA camps is now part of the State park . Concrete was discovered ages ago , the lake provides sand and gravel so it was used a lot around here . The late 1800's we had many estates , industrial millionaires who built along the lake , they had concrete water pump houses , poured boat docks that extended up to 100 Ft from shore . Getting long here , so hope to see other answers. HH