I wound up riding 676 last month. I wouldn't call 676 a good road if you like to ride at a spirited pace. Especially in the direction going towards Marietta. The turns aren't "flowing" and there are a few decreasing radius corners that can bite you if your pace it too quick. The jump is heading toward Marietta, I believe between 555 and 792. In one of the straights there is a sign that says "Bump 25 mph," but it's really a small hill about 8 ft tall. It looks pretty innocent, but if you are going over 65-70 you will get airborne.