Katmai National Park

On June 6, 1912, the Novarupta vent erupted on the Alaska Peninsula in what was the most powerful volcanic eruption of the 20th century, thirty times more powerful than the 1980 Mount St. Helens eruption. The eruption expelled roughly 7 cubic miles of magma, collapsing the summit of nearby Mount Katmai and burying 40 square miles of the Ukak River valley in ash and pumice to depths of hundreds of feet. When explorer Robert Grigg visited the valley in 1916, he found thousands of steam jets rising from the cooling ash — the "ten thousand smokes" that gave the valley its name. Most fumaroles have since gone dormant, but the landscape remains an otherworldly expanse of hardened ash, pumice, and carved canyons. The eruption also created the Katmai caldera, now a 2-mile-wide crater lake. The park contains at least 14 active volcanoes and part of the Pacific Ring of Fire, making it one of the most volcanically active areas in the United States. Earthquakes are frequent, and the landscape continues to be shaped by tectonic and volcanic processes.

Brooks Camp on the Naknek River is the epicenter of bear viewing at Katmai. Each summer, sockeye salmon return from the Pacific to spawn in Brooks Lake and the Naknek River, and brown bears gather at Brooks Falls to intercept them. From a network of elevated viewing platforms, visitors can watch bears standing on the lip of the falls, snatching leaping salmon from the air — one of the most iconic wildlife spectacles in North America. The peak of bear activity is in July, when up to 50 or more bears may be visible in a single day, and again in September when later salmon runs arrive. The Brooks Falls wildlife viewing platform is a 1.2-mile walk from the visitor center, and a floating bridge crosses the Brooks River. Bear activity is monitored closely by rangers, and viewing areas may close temporarily if bears approach too closely. Photography and videography are the primary activities here, and the live bear cam operated by explore.org allows remote viewing as well.

Katmai has no road access. The most common entry point is via bush plane from King Salmon, which is served by commercial flights from Anchorage. Several air taxi operators fly directly to Brooks Camp from King Salmon, Homer, or Anchorage, with flights costing several hundred dollars per person round trip. Brooks Camp has a small visitor center, a campground (reserve well in advance through Recreation.gov), and the historic Brooks Lodge, which offers meals and lodging. Backcountry travelers should be fully self-sufficient and prepared for true wilderness, including bear safety training, water filtration, and weather-appropriate gear. Bear spray is essential, and firearms are generally not recommended for bear defense. The park offers no maintained trails outside the Brooks area; most backcountry travel is cross-country or along river bars. Permits are required for overnight backcountry camping. Weather can delay flights for days, so flexible itineraries are critical. Costs are high: a typical 3-day visit can exceed $1,000 per person in transport and lodging alone.

Katmai's season is short and concentrated in summer. June brings long daylight hours and the first salmon runs to Brooks, though bear numbers are lower than in July. July is the peak for bear viewing at Brooks Falls and the busiest time for the park — campground reservations and lodge bookings fill months in advance. August sees fewer bears at Brooks as salmon disperse into the lake system, but it is prime time for backcountry river trips and rafting on the Savonoski River or the American Creek. September brings a second wave of bear activity as the later salmon runs arrive, and fall colors add striking visual drama to the landscape. October can offer good bear viewing but weather becomes more volatile. Winter access is essentially limited to ski-plane or snowmobile trips for hardcore adventurers, as most facilities close and daylight is minimal. Mosquitoes are intense from June through August; head nets and DEET are necessities for any backcountry travel during those months.