Putnam County played an important role in the Civil War. One third of the county's men between the ages of 15 and 55 served in the military during the war years. During the post-Civil War years, industry and agriculture suffered losses as the economy contracted. Iron, which was produced in the Highland Mountains, could be found elsewhere. Agriculture was also affected greatly. The increasing need for drinking water in New York City led the city to search for sources in the Hudson Valley. In Putnam County, much of the farmland was flooded to create reservoirs as part of New York City's Croton Watershed. The abandoning of farms, the creation of reservoirs, and the preservation of the remaining open land resulted in scenic lands that drew large amounts of tourism from New York City.
Putnam County played an important role in the Civil War. One third of the county's men between the ages of 15 and 55 served in the military during the war years. During the post-Civil War years, industry and agriculture suffered losses as the economy contracted. Iron, which was produced in the Highland Mountains, could be found elsewhere. Agriculture was also affected greatly. The increasing need for drinking water in New York City led the city to search for sources in the Hudson Valley. In Putnam County, much of the farmland was flooded to create reservoirs as part of New York City's Croton Watershed. The abandoning of farms, the creation of reservoirs, and the preservation of the remaining open land resulted in scenic lands that drew large amounts of tourism from New York City.