Grinnell Glacier was in the heart of Glacier National Park in the U.S. state of Montana. The glacier is named for George Bird Grinnell, an early American conservationist and explorer, who was also a strong advocate of ensuring the creation of Glacier National Park. The glacier is in the Lewis Range and rests on the north flank of Mount Gould at an altitude averaging 7,000 feet (2,100 m), in the Many Glacier region of the park.
In Northstar Rising, Mildred mentioned that she used to hike in Glacier National Park, and specifically mentions Grinnell Glacier - the same area where Redoubt Bravo is located. She also competed in a shooting competition in Cripple Creek, Colorado - JB's hometown (Genesis Echo).