sentences:  It continues a few miles in that direction until it joins a tendril of the Cross River Reservoir, a part of the New York City water supply system.A part of both the Croton River watershed and the system's Croton Watershed, it flows out of the reservoir's spillway then joins the Croton River in Katonah.The short stretch of river that begins at the spillway outlet and continues on to the river's entry into the Muscoot Reservoir is an early spring trout fishery.