A landslide in Trinity County completely covered the county road. The failure was linked to massive groundwater seeping out of the hill, creating an unstable mud mass. Thunder Mountain solved the problem and repaired the slide by installing deep drains excavated into the slope and drained underneath the road section. Brow ditches were installed at the top of the scarp to divert flow on to the slope. Spoil was hauled away, slope contours restored and the slope treated with erosion control measures.
