Lewis and Clark County Historical Society, Inc. Helena, MT Email Address: Lewis and Clark County Historical Society, Inc. 618 Helena Avenue Helena, MT Info: Website 406.422.0546 Region: Helena Upcoming events at Lewis and Clark County Historical Society, Inc. Oct 10 Sat Exhibition: One Historic Journey by Louis Archambault Oct 10 - Oct 31 Helena Lewis and Clark County Historical Society, Inc. Art & Exhibits Oct 13 Tue The Precontact Archaeology of Lewis and Clark County Oct 13 Helena Lewis and Clark County Historical Society, Inc. Lectures