Welcome to ''Fern Bridge,'' an exquisite Bobby McAlpine-designed retreat. 520+/- waterfrontage. An almost 2.67 mile view in the heartbeat of Lake Martin. Rustic elegance drips from every detail of this 4.88 acre estate. The well-placed abundance of shoreline foliage provides executive privacy, sought-after by the wealthy. Two stories of ''main level'' living, and an additional bunk room suite on the terrace level. Cross a wooden bridge to enter the Gothic style door from the top-level drive. Three guest bedrooms and two baths + a keeping room are on the upper level. Step down the grand stairs to the main living spaces: Living Room with soaring, heavily-beamed ceilings and a 17' inset window to the water. The kitchen is built for entertaining - two refrigerators, two dishwashers and tons of