The lateral margin of the lahar deposit about 2.5 km from the base of Casita Volcano consists of a levee about 10-15 cm high. The levee deposit is composed of pebbles in a muddy matrix. The characteristics of the deposit indicate that the lahar at this site was moving as a debris flow. After the landslide had transformed into a hyperconcented flow (40-80% sediment by weight) at the base of Casita, the lahar eroded additional sediment to transform into a debris flow (>80% sediment by weight).