The Snake River is a tributary of the Niobrara River. Entirely located within the Sandhills of north-central Nebraska, the Snake River rises near the eastern edge of Sheridan County. It flows eastward into Cherry County and passes along the southern edge of Samuel R. McKelvie National Forest. On the southeast edge of the national forest, the river is dammed by Merritt Reservoir. At this point, the river makes a sharp turn to the north.