More than 200 people were rescued Friday as heavy rains pummeled the Hawaiian island of Oahu and triggered the worst flooding the island has in 20 years. Hawaii Gov. Josh Green says the damage could top $1 billion. Muddy floodwaters from severe rains have inundated communities and prompted evacuation orders for more than 5,500 people in towns north of Honolulu. Officials are warning about the possible failure of a 120-year-old dam. Officials have been watching dam levels since a storm last week dumped heavy rain across the state, which led to catastrophic flooding that washed away roads and homes.