Instead of repairing or installing a retaining wall, create a vegetated bank. Lawns are not effective at erosion control or filtering runoff. Don't add sand or other fill to the lake. Adding sand suffocates the natural bottom habitat, plus can introduce polluting silt to the water. Keep Soil on the Ground Keep land disturbance well back from the water.
Sediment carries the nutrient phosphorus to lakes, causing algae blooms and excessive weed growth.
Turbidity threatens fish and other aquatic life. Install waterbars to direct flow into vegetated areas. Rock-line steep ditches. Crown it annually. Relocate it if necessary.