Katmai was not set aside for its bears. In June 1912, Novarupta expelled roughly 13 cubic kilometres of magma, the largest volcanic eruption of the twentieth century, burying a river valley under ash up to 200 metres deep.
The eruption drained a chamber beneath Mount Katmai, whose summit collapsed into a caldera that now holds a jade-coloured lake. Botanist Robert Griggs, sent north by the National Geographic Society, crossed the ridge in 1916 and found the ground venting steam from thousands of fissures. He named it the Valley of Ten Thousand Smokes. Two years later, President Woodrow Wilson declared the region a national monument. Congress redesignated it a national park and preserve in 1980.
The brown bears entered public view much later. Brooks Falls sits roughly 1.9 kilometres upstream of Brooks Camp, a low ledge barely two metres high where the Brooks River drops on its short run between Brooks Lake and Naknek Lake. Sockeye salmon stall beneath the lip in their millions. Bears learned to stand in the standing wave and take fish from the air, jaw open, and the behaviour has been passed between generations for decades. Some 2,200 brown bears range across the park and preserve, among the densest protected populations on earth, and Brooks Falls Katmai Bear Viewing in a Float Plane tours exist for a simple reason: no road reaches the ledge.
Human presence here is far older than the monument. The Brooks River Archeological District, a National Historic Landmark, preserves evidence of about 4,500 years of occupation — hundreds of semi-subterranean house depressions cut into the terraces above the water, with ash layers from successive eruptions stacked between living floors like pages. The camp visitors see today is deliberately light: elevated boardwalks, a raised bridge completed in 2019, and viewing platforms that hold people above the animals rather than among them.
That restraint defines the park's modern character. Katmai charges no entrance fee — entry is 0 USD, and no entrance pass is required — yet the site remains among the least accessible in the American park system. Every Brooks Falls Katmai Bear Viewing in a Float Plane tour is therefore a logistics problem solved by aircraft: a de Havilland Beaver on floats, a water landing, a gravel beach standing in for a runway. Katmai bear viewing flights and Brooks Camp floatplane trips have not tamed the place. The Alaska Peninsula keeps its distances, and the bears keep the falls.
6 hr 30 min
