UPDATE: 4:28 p.m. â€“ U.S. 395 has just been closed at Haiwee Reservoir due to flooding and extensive mud and debris, according to Caltrans Public Information Officer Florene Trainor. Whitney Portal Road, meanwhile, remains closed while county road crews attempted to fix extensive damage caused by overnight flooding. The threat of flash floods in Death Valley continues. With rain continuing to fall, Sheriff Bill Lutze said his office was "keeping an eye" on the streams as well as the thunderheads building over Mt. Whitney. S.R.