advertisement GRASS VALLEY, January 12, 2017 – Engineering firm Holdrege & Kull shared their aerial video showing a sinkhole caused by a damaged culvert on Wolf Creek in Grass Valley, CA. Related NewsThe Little Wolf Creek Sinkhole Time Lapse Video – January 11, 2017 to January 10, 2018February 7, 2018Little Wolf Creek Sinkhole from January 11-17 – videoJanuary 17, 2017Work resumed on Little Wolf Creek sinkhole in Grass Valley (video)June 16, 2017
