Chilly Slough is a natural, high desert, spring fed wetland of public, state, and private lands. It is approximately 5,000-6,000 acres in size, located at the base of the Lost River Range and Mt Borah, Idaho?s tallest mountain peak. This is a designated wildlife viewing site, featuring a palustrine, emergent wetland with a mix of cattail, sedge, Baltic rush, greasewood/wildrye vegetation.

Ornithological Summary

High numbers of migrating waterfowl (Mallard, Gadwall, Northern Shoveler, Northern Pintail, Cinnamon Teal, Tundra and Trumpeter Swan) and raptors (Northern Harrier, Peregrine and Prairie Falcon, Bald Eagle). Supports breeding populations of waterfowl (same species as listed above, minus Swans). Also present during spring and summer months are waterbirds (Sora, American Bittern, Sandhill Crane), shorebirds (Willet, Long-billed Curlew, Wilson?s phalarope), Northern Harriers, Marsh Wrens, and Yellow-headed Blackbirds.

Conservation Issues

Overgrazing by livestock on private lands is a problem, and there is a potential for diversion of water from headwater springs. However, to alleviate some of the private lands issue, BLM and IDFG have acquired an additional 1,082 acreas; for a total of 1,820 acres.


Palustrine emergent wetlands. Vegetation primarily consists of Carex fen, cattail marsh, Baltic rush, greasewood/wildrye. Flat topography. High, cold desert with spring fed streams.

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