Lakes naturally fill up with mud over time due to sediment carried by inflowing water, erosion from surrounding land, and the buildup of decaying plants and organic matter. As water slows down in a lake, soil, sand, and silt settle at the bottom, gradually reducing depth and water quality. Increased algae growth, turbidity, and surface scum are common signs of this process. Managing erosion and controlling runoff can help slow sediment accumulation and extend a lake’s lifespan. Learn more here: https://www.aquaticrestoration.net/why-do-lakes-fill-up-with-mud-over-time