mackay-reservoir

Mackay Reservoir is a feature on Big Lost River, Idaho.

Also called McKay Reservoir.

Wood River Weekly also lists it as a stillwater (with Magic and Little Wood reservoirs).

It is upstream of Big Lost River Tailwater.

It is downstream of Big Lost River Main Stem.

Sourced from 3 sites.

Sources: Idaho Department of Fish and Game (retrieved 2026-10-29), The Perfect Fly Store, The Perfect Fly Store (2) and woodriverweekly.com.

Access, closures and rules change; check with the state agency before you go.