<P> South of the Federal Dam, the Hudson River begins to widen considerably . The river enters the Hudson Valley, flowing along the west bank of Albany and the east bank of Rensselaer . Interstate 90 crosses the Hudson into Albany at this point in the river . The Hudson then leaves the Capital District, forming the boundary between Greene and Columbia Counties . It then meets its confluence with Schodack Creek, widening considerably at this point . After flowing by Hudson, the river then forms the boundary between Ulster and Columbia Counties and Ulster and Dutchess Counties, passing Germantown and Kingston . The Delaware and Hudson Canal meets the river at this point . The river then flows by Hyde Park, former residence of Franklin D. Roosevelt, and alongside the city of Poughkeepsie, flowing under the Walkway over the Hudson and the Mid-Hudson Bridge . Afterwards, the Hudson passes Wappingers Falls and takes in Wappinger Creek . The river then forms the boundary between Orange and Dutchess Counties . It flows between Newburgh and Beacon and under the Newburgh Beacon Bridge, taking in the Fishkill Creek . In this area, between Gee's Point at the US Military Academy and Constitution Island, an area known as "World's End" marks the deepest part of the Hudson, at 202 feet (62 m). Shortly thereafter, the river enters the Hudson Highlands between Putnam and Orange Counties, flowing between mountains such as Storm King Mountain, Breakneck Ridge, and Bear Mountain . The river narrows considerably here before flowing under the Bear Mountain Bridge, which connects Westchester and Rockland Counties . </P> <P> Afterward, leaving the Hudson Highlands, the river enters Haverstraw Bay, the widest point of the river at 3.5 miles (5.6 km) wide . Shortly thereafter, the river forms the Tappan Zee and flows under the Tappan Zee Bridge, which carries the New York State Thruway between Tarrytown and Nyack in Westchester and Rockland Counties respectively . South of the Tappan Zee Bridge, the west bank of the Hudson becomes Bergen and Hudson Counties of New Jersey, and further south the east bank of the river becomes Yonkers and then the Riverdale neighborhood of the Bronx in New York City . The Palisades, large, rocky cliffs along the west bank of the river, begin along the west bank of the river opposite the Bronx . South of the confluence of the Hudson and Spuyten Duyvil Creek, the east bank of the river becomes Manhattan . The river is sometimes still called the North River at this point . The George Washington Bridge crosses the river between Fort Lee and the Washington Heights neighborhood of Manhattan . The Lincoln Tunnel and the Holland Tunnel also cross under the river between Manhattan and New Jersey . South of the Battery, the river proper ends, meeting the East River to form Upper New York Bay, also known as New York Harbor . Its outflow continues through the Narrows between Brooklyn and Staten Island, under the Verrazano Bridge, and into Lower New York Bay and the Atlantic Ocean . </P> <P> The lower Hudson is actually a tidal estuary, with tidal influence extending as far as the Federal Dam in Troy . Strong tides make parts of New York Harbor difficult and dangerous to navigate . During the winter, ice floes may drift south or north, depending upon the tides . The Mahican name of the river represents its partially estuarine nature: muh - he - kun - ne - tuk means "the river that flows both ways ." The Hudson is often mistaken for one of the largest rivers in the United States, but it is an estuary throughout most of its length below Troy and thus only a small fraction of fresh water, about 15,000 cubic feet (425 m3) per second, is present . The mean fresh water discharge at the river's mouth in New York is approximately 21,400 cubic feet (606 m3) per second . The Hudson and its tributaries, notably the Mohawk River, drain a large area . Parts of the Hudson River form coves, such as Weehawken Cove in the towns of Hoboken and Weehawken in New Jersey . </P> <P> The salt line of the river varies from the north in Poughkeepsie to the south at Battery Park in New York City, though it usually lies near Newburgh . </P>

Where does the hudson river become fresh water
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