A massive water main break flooded numerous streets in North Park and left many vehicles partially submerged Thursday morning. San Diego water officials said a 24-inch transmission water main broke shortly before 7:30 a.m. in the 4100 block of Idaho Street, near Polk Avenue and the North Park Community Park. Several San Diego water department crews were dispatched to various nearby areas to repair the break. Water flow was shut off by 10 a.m. Officials said repairs were expected to continue through the evening.