A gem of a Tail Water within the gem state. The Lost River, near Mackay, can be a great example of big fish in small water. The Lost is a unique fishery for anglers with some experience. Sight nymphing to big rainbows is common, as well as a few strong dry fly opportunities throughout the year. The cool waters released from the dam at Mackay reservoir provide a nutrient rich environment that grows strong rainbows up to 25 inches.

Landing fish in the Lost may be harder than actually hooking them. Swift currents loaded with woody debris give most large fish a big advantage over the angler. Our guides can help you navigate these waters safely and successfully on a full days trip. The Lost River also offers fine fishing in many miles of tributaries, mostly located in the Copper Basin area, above Trail Creek summit. The Big Lost is always an adventure, even on the slowest days fishing, the drive itself, offers spectacular views of Devil’s Bedstead in the Pioneer Mountains, as well as Mt. Borah, Idaho’s highest peak, within the Lost River Range. Moose, antelope, bear, and elk sightings are not uncommon, and definitely add to this angling adventure

Book a Guide Trip

Open Year Round 

Species Available
  • Rainbow Trout
  • Brook Trout
  • Mountain Whitefish 
Guiding Options
  • Full Day — $650 per day for 1 to 2 anglers
  • The Big Lost is an hour and a half to two-hour drive and requires a full day trip.

The Big Lost is

always an adventure, 

even on the slowest days fishing.