
Peekskill Hollow Creek is a creek in central westernPutnam County, New York, mainly in the town ofPutnam Valley. Approximately 17 miles (27 km) in length, it originate as the outflow of Lake Tibet in the southwestern part of the town ofKent and flows southwest towards the town ofPeekskill in farthest northwestWestchester County. For several miles after leaving Kent it serves as the border between the towns ofCarmel and Putnam Valley.
Upon leaving Putnam Valley it enters the town ofCortlandt in Westchester County. Approaching theHudson River it joins the confluence of two much smaller streams, the Sprout Brook and Annsville Creek, named after the latter, by which name all three enter the river after less than a mile. The creek's drainage area, which includes manmadeLake Peekskill in Putnam Valley, is slightly more than 47 square miles (120 km2). There is a small dam 0.8 miles (1.3 km) upstream of its mouth atVan Cortlandtville.
In Colonial times and beyond, before Putnam County's topography was well understood and its features given names, it was thought by some that Peekskill Hollow Creek's headwaters drained from what is today'sBoyds Corner Reservoir in the town of Kent one mile to Lake Tibet's east. Instead, it drains eastward into theCroton River watershed, part of theNew York City water supply system.

41°22′55″N73°49′05″W / 41.382°N 73.818°W /41.382; -73.818