GRASS VALLEY, Calif. January 17, 2017 – Slope stabilization work is underway at a massive sinkhole in Grass Valley. The sinkhole appeared during the last storm behind Liberty Motors in Grass Valley and was reportedly caused by a clogged city drain pipe.
Work is now underway to mitigate the unstable sides and the area remains closed to the public.
A video by engineering firm Holdrege & Kull posted on January 12 showed the initial size. By now, the sinkhole is seven stories deep, according to Tim Kiser with the City of Grass Valley.
Today, the Nevada County BOS declared a state of emergency, Grass Valley and Truckee declared local emergencies as early as January 11.