The worst flooding to hit Hawaii in two decades swept homes off their foundations, floated cars out of driveways and left floors, walls and counters covered in thick, reddish volcanic mud. Crews continued to assess the destruction Monday, but authorities said hundreds of homes were damaged, along with some schools and a hospital. No deaths have been reported, but more than 230 people had to be rescued. Gov. Josh Green said the cost of the storm could top $1 billion, including damage to airports, schools, roads, homes and a Maui hospital. He called it the state’s most serious since flooding since 2004.

Hawaii has suffered its worst flooding in more than 20 years as heavy rains fell on soil already saturated by downpours from a winter storm a week ago. Officials say more rain is expected over the weekend. Muddy floodwaters have smothered vast stretches of Oahu’s North Shore, a community world-renowned for its big-wave surfing. Raging waters have lifted homes and cars and prompted evacuation orders for 5,500 people north of Honolulu. Authorities caution a 120-year-old dam could fail. Gov. Josh Green says the cost of the storm could top $1 billion, including damage to airports, schools, roads, people’s homes and a Maui hospital in Kula.