It holds water very well from what I can see thusfar...
It's worth mentioning that the dozer operator spent a long time compacting the clay. There may have not been a sheepsfoot roller in this relatively small space, but the dozer is heavy and the tracks work well as a substitute. This is especially true if the clay is of high enough quality for holding water.
The soil chapter of Mike Otto's book talks about using multiple passes with a dozer for soil compaction.
/c
Does it hold water well, since it was built using only dozer and backhoe, and not compacted with a roller?
