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Noatak National Preserve

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Through Taiga and Tundra

All of the preserve, except for about 700,000 acres (280,000 ha) east of the village of Noatak, has been designated the 5,765,427-acre (2,333,186 ha) Noatak Wilderness. The wilderness is the fourth-largest in the United States, following the Wrangell-Saint Elias Wilderness, the Mollie Beattie Wilderness, and the Gates of the Arctic Wilderness.

Ecology and geology

The preserve includes the transition zone from boreal forest to tundra near the southern edge of the preserve. The Noatak Basin is a transition zone for plants and animals between Arctic and subarctic environments. The lower portion of the Noatak valley has areas of boreal forest, but most vegetation is low-growing tundra species. Alpine tundra occurs at high elevation, and moist tundra, the most common condition, supports cottongrass, willows, Labrador tea, mountain alder, dwarf birch and other tundra species at lower elevations. Boggy areas support cranberry, bog rosemary and salmonberry.

Wildlife of the Noatak tundra includes Alaskan moose, grizzly bears, black bears, wolf packs, Arctic foxes, lemmings, Dall's sheep, vast herds of caribou numbering more than 230,000 individuals, and a variety of birds. Larger birds include Canada geese, tundra swans, white-fronted geese and common, Arctic, yellow-billed and Pacific loons. Predatory birds include rough-legged hawks, gyrfalcons and golden eagles.

The central feature of the preserve is the Noatak River, and is a breeding ground for a variety of commercially important fish. The most widespread salmon species is chum, and pink, chinook and sockeye salmon are found as well. Several kinds of trout are found in deep lakes, with Arctic char and Arctic grayling the most common salmonids in the preserve. Burbot are also found, as are nelma or sheefish, an important species for subsistence fisheries.

The Brooks Range has existed since Cretaceous time, and is composed mainly of shales, limestone and chert, with intrusions of igneous rocks from more recent volcanism. The valleys are composed of limestone, sandstone and siltstone, with deposits of sand, gravel, silt and clay. During the Wisconsonian glaciation the area was incompletely covered by ice, with higher regions glaciated. Permafrost exists in higher regions, becoming patchy at lower levels.

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