The Muscoot is the outlet of the celebrated Lake Mahopac in Putnam County, and the Cross (also called the Peppenegheck ) of Lake Waccabuc, one of the largest of the Westchester lakes. The Croton watershed lies almost wholly in the State of New York, although draining a small area in Connecticut. It extends about thirty-three miles north and south and eleven miles east and west, and has an area of 339 square miles above the present Croton Dam, to which about twenty square miles will be added when the great new dam, now in process of construction, is completed. This watershed embraces thirty-one lakes and ponds in Westchester and Putnam Counties, many of which have been utilized as natural storage basins in connection with the New York City water supply by cutting down their outlets and building dams across. Besides Croton Lake, there are two very large reservoirs in our county incidental to the Croton system -- the Titicus Reservoir near Purdy's and the Amawalk Reservoir. The Croton Lake is by far the most extensive sheet of water in the county. It is formed by a dam about five miles east of the mouth of the Croton, and has an ordinary length of some three and one-half miles. When the new dam is finished the length of the lake will be in excess of eleven miles. From the lake two aqueducts, the wk Old " and the " New," lead to the city. The former is thirty-eight and the latter thirty-three miles long, the distance in each case being measured to the receiving reservoir. It is the old aqueduct