The Caltrans Quickmap indicates California State Route 175 which runs from Hopland into Lake County is fully closed this morning.
According to the Caltrans Quickmap, the closure is due to tree work and says there is no estimated time for reopening of the closure.
UPDATE 9:47 a.m.
The Caltrans Quickmap indicates the trees blocking Highway 175 have been cleared and the road is now passable.