Retaining walls are designed to prevent soil from shifting on a slope or curve; without the retaining wall, the soil would spill over and find its natural place. Retaining walls can be made from different materials and colors from concrete to stone to brick and even plastic. These walls may seem simple however, they require a great deal of planning, especially large-scale retaining walls, to prevent bulging or even collapsing because the soil is very heavy. The retaining walls provided by Boulder Ridge Land Clearing and Excavation are available in different materials and colors for different soil types.