- Fish Passage Project
Lemhi River, ID
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Flow of the Lemhi River during August, 2000. This riffle presents the
first natural obstruction to spawning salmon returning from their 1,350
mile journey to the Pacific Ocean. They have already passed the dams on
the Columbia River.
They have traveled the length of the Salmon River, and have only 30 miles
left to go to reach their spawning grounds on the west side of the Bitterroot
Mountains of Montana. This stream channel is 100' wide.
The objective of the stream diversion is to concentrate stream flow
so that the salmon can get up and over the 3' high riffle,
and to restrict the 100' wide river down to 10 feet to increase water depth
and flow and decrease temperature.