The former river is the chief source of the water supply of New York City; the latter -- which, by the way, also furnishes water to New York -- has many historic and romantic associations, dear to New Yorkers as well as Westchester people, and its name has been adopted for one of the beautiful new parks of the city, and also for one of the five grand divisions which constitute the Greater New York. Some half dozen streams of noticeable size find their outlets in the Hudson. Peekskill Creek gathers its waters from the hills of the northwestern corner of the county, and flows into the Hudson just above the village of Peekskill. Furnace Brook is a small rivulet which empties into the river several miles farther south. Then comes the Croton, having its outlet in Croton Bay, as the northeastern portion of the Tappan Sea is called. The Croton has its sources in Dutchess County -- these sources comprising three " branches " ( the East, Middle, and West), which unite in the southern part of Putnam County. In its course through Westchester County to its mouth, the Croton receives as tributaries the Muscoot, Titicus, Cross, and Kisco Rivers. 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.