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

HISTORY

WESTCHESTER

COUNTY

which crosses the Harlem River over High Bridge; the new is carried underneath the stream.

Iii3|j*

South of the Croton River the next Hudson tributary of interest is the Sing Sing Kill, which finds its mouth through a romantic ravine crossed by the notable Aqueduct Bridge. Next comes the Pocantico River, entering the Hudson at Tarrytown. The last feeder of the

PHYSICAL

DESCRIPTION

COUNTY

1]

Hudson from Westchester County, and the last received by it before discharging its waters into the sea, is the Sawmill (or Nepperhan ) River, at Yonkers. To this stream is due the credit for the creation of a very considerable portion of the manufacturing industries of the county, and consequently, also, to a great extent, that for the building up of the City of Yonkers. 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.