The water is slowly filling the pool, starting from the center, which is the deepest part. There were some people powerwashing to bottom and there were a number of trucks and trailers parked in the pool but out of the water. There was a group of people in an ATV that seemed to like driving through the water and did it multiple times. Even at this stage, the pool is reflecting the trees around it (and the Washington Monument if you are directly in line).
