The Rio Cebolla is a small stream that heads above Seven Springs and flows south into Fenton Lake. The stream flows out of Fenton below the dam and continues its journey south where it joins with the Rio de las Vacas to form the Rio Guadalupe. Most of this river is meadow fishing with many undercut banks, beaver dams and portions of thick brush. The upper most section is considered special trout water with restrictions and lots of hungry native Rio Grande Cutthroat Trout. Right above the lake, the Rio Cebolla is stocked with Rainbow Trout. The lower section (below the lake) holds a surprising amount of larger Brown Trout.