Into the Spuyten Duyvil Creek empties Tibbet's Brook, a small runlet which rises in the Town of Yonkers and flows south, passing through Van Cortlandt Lake ( artificial ). The most noteworthy of the streams emptying into the Sound is the Bronx Eiver, whose outlet is between Hunt's Point and Cornell's Neck. The Bronx lies wholly within Westchester County, having its headwaters in the hills of the towns of Mount Pleasant and New Castle. It traverses and partially drains the middle section of the county. This river, with other waters which have been artificially connected with it, affords to New York City a water supply of its own, quite independent of the Croton system- -a fact, perhaps, not generally understood. It is dammed at Kensico Station, making a storage reservoir of 250 acres. A similar dam has been thrown across the Byram Eiver, and another across the outlet of Little Bye Pond. By the damming of Little Rye Pond that body of water, with Rye Pond, has been converted into a single lake, having an area of 280 acres. The three parts of this system -- the Bronx, Byram, and Rye Poml reservoirs -- are, as already stated, connected artificially, and the water is delivered into a receiving reservoir at AY illiams's Bridge through the so-called Bronx River pipe line, a conduit of forty-eightinch cast-iron pipe. The portion of the Bronx watershed drained for this purpose has an area of thirteen and one-third square miles. East of the mouth of the Bronx River on the Sound are the outlets of AYestchester and Eastchester Creeks -- tidal streams -- emptying, respectively, into AVestchester and Eastchester Bays. The Hutchinson River rises in Scarsdale and flows into Eastchester Bay. The Mamaroneck River has its source near White Plains and Harrison, findingits outlet in Mamaroneck Harbor.