"Patching a spillway is not like patching a sidewalk in front of your house," said Mark Hutchinson, deputy public works director in San Luis Obispo County, where it took four years for officials to pinpoint and fix the cause of a small leak near Lopez Dam.
"If we were to build it today what would be different? If there is something that would be different, what are the implications of that?" he said. "There's some good stuff to sink your teeth into."