In late spring , mid-May to mid-June , the Lochsa River is rated as one of the world 's best for continuous whitewater .
The Lochsa and Selway rivers and their tributaries have no dams , and their flow is unregulated .
In late spring , mid-May to mid-June , the Lochsa   is rated as one of the world 's best for continuous whitewater .
The Lochsa and Selway rivers and their tributaries have no dams , and their flow is unregulated .