2017 Map of Big Lost River Sinks

About this map

The Lemhi Range provides a stark topographic contrast to the low-lying plains where the Big Lost River terminates in this 2017 survey. This unique hydrological landscape is centered on the Big Lost River Sinks, a series of ephemeral basins where surface waters disappear into the Snake River Plain aquifer. The arid nature of the region is further evidenced by the Dry Channel Big Lost River, which illustrates the erratic and seasonal flow patterns typical of this part of Idaho. Modern infrastructure like Lincoln Blvd and Cinder Butte Rd cuts across the vast open sections of T6N and T5N, providing access to this desert terrain where the river's journey ends in the sand and sagebrush.