Fish Passage Project,
Lemhi River, Salmon River, ID

Phase 1, Page 1:

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 feet wide.

The objective of the stream diversion is to concentrate stream flow so that the salmon can get up and over the 3 foot high riffle (picture #1), and to restrict the 100 foot wide river down to 10 feet to increase water depth and flow and decrease temperature. 

 

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