The previous owners of our house built a bridge that led to the pool. We think they maybe tried to have a Koi Pond under the bridge, but we will never know. The entire yard was so darn scary. We jack-hammered the concrete under the pond so I could plant it up. Four years ago I planted hydrangeas and today they are glorious. I spent way too much of my damn precious time painting the damn bridge. It peeled and a lot of the wood was rotting.