thumb|250px|the ausable river the ausable river , also known as ausable river and originally written as "au sable", runs in the u.s. state of new york, from the adirondack mountains and past the village of lake placid and au&nbsp;sable forks to empty into lake champlain (at ) it has an east and west branch that join at ausable forks ny. a few miles east of keeseville, new york. the river forms a partial boundary between clinton county and essex county. the ausable river is known for its spectacular gorge, ausable chasm, and its trout fishing known as one of the best eastern trout rivers in usa. the ausable river is  long and drains a watershed of .ausable river valley bridges mps ==west branch ausable river== the west branch of the ausable arises from the conjunction of the macintyre, south meadow and marcy brooks, east of mount jo near the adirondak loj; it then runs  northeast to au&nbsp;sable forks (), and is fed by lake placid and the chubb river along the way. at high water-levels, the upper end provides demanding white-water paddling opportunities. further along, it runs through high falls gorge at the wilmington notch, a gorge formed by a fault zone, with  cliffs on one side and  cliffs on the other.jamieson, paul and morris, donald, adirondack canoe waters, north flow, lake george, ny: adirondack mountain club, 1987, pp. 259â260. isbn 0-935272-43-7. ==east branch ausable river== the east branch arises from upper and lower ausable lakes in the ausable valley, which forms the south side of the great range. the first  are especially scenic, and can be viewed from trails on either side maintained by the adirondack trail improvement society. the river is then met by the cascade brook which flows from the cascade lakes, beneath cascade mountain, on its way to au&nbsp;sable forks.ibid., pp. 270â272. ==see also== *list of rivers in new york ==references== 
Adirondacks Landforms_of_Clinton_County,_New_York Landforms_of_Essex_County,_New_York Rivers_of_New_York Tributaries_of_Lake_Champlain