Butte County, Idaho (ID), United States, North America
Latitude
unknown
Longitude
unknown
Big Lost River
, c.120 mi/193 km long,
central Idaho; rises in Pioneer Mts. of S Caster co., N of Hyndman Peak
(Challis Natl. Forest); flows NE then SE through Mackay Reservoir, past
Mackay and Arco, past EBR-1 nuclear reactor (Natl. Historic Landmark),
and into a depression in E part of Butte co. in tract of Idaho Natl.
Engineering Laboratory. Dam in upper course
(4 mi/6.4 km NW of Mackay) forms Mackay
Reservoir. Big Lost and Little Lost rivers center into the subterranean
Snake River Plain Aquifer and reemerge at Thousand Springs, on Snake
R., c.100 mi/161 km to SW,
20 mi/32 km WNW of Twin Falls.
Capital city or county seat is shown by the symbol
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