UPDATE: Rock Creek Fire estimated at 500 acres and growing Justin Meadows and last updated 2021-07-11 00:26:22-04 GREAT FALLS â Update 10:15 p.m. - The Montana Department of Natural Resources and Conservation (DNRC) provided an update on the Rock Creek Fire Saturday night. DNRC along with partners from the Helena Lewis and Clark National Forest, MDOT, MT Highway patrol, Lewis and Clark county Sherriff office, and Lewis and Clark County, and County Mutual Aid from many volunteer fire departments are working to contain the Rock Creek Fire located north of Helena, MT near Mile Marker 1 on Highway 287. The Rock Creek Fire is estimated to be about 500 acres and is currently growing.