The first stage is a small, aluminum plaque attached to a piece of wood. The cache is a small decon container.
Riverdale road is a high-traffic road. You won't want to even think about stopping on this road. This is why I attached the first stage to a piece of wood away from the cache location. Park nearby and look for the small piece of aluminum attached to a piece of wood with the fractional minute coordinates etched on it. The actual cache is within easy walking distance. If you can touch the trees or the sign, you are looking in the wrong place. The cache is also not in the five-foot-deep hole.