Big Lost River - Hailey, ID

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Big Lost River


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Big Lost River is a tail water fishery with rainbow trout. It has a high average trout size, generally in the 15 to 19 inch range. This river originates in the Pioneer Mountains east of Sun Valley and flows through the Lost River Valley with great views of the Lost River Range which has the highest peak in Idaho, Mt. Borah. The river runs into Mackay Reservoir, and visitors should fish the river below this dam and reservoir.

Guided trips to this river are available on a full-day basis only. It is slightly over an hour's drive from either Picabo or the Sun Valley area. Like the Big Wood River, the Lost River is affected by the winter snowpack and runoff. With Mackay Reservoir full from the winter's thaw, the releases from the dam can keep the river high until late June. Once the water releases from Mackay reservoir are cut back, fishing and wading become possible.

By August small black quills and blue wing olives hatch and large rainbow trout move into the shallow edges and riffles to dine on these mayflies. Great stalking and sight fishing is had casting small dry flies and nymphs.

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