Fishing at Triangle Lake, Boise County, Idaho

• Overview

  Triangle Lake falls in Boise County, part of Idaho. It lies 8,278 feet above sea level. Small at around 6 acres: two anglers spread out cover most of it. Ketchum is the closest town at 43 miles. Boise sits 57 miles out, and it is the nearest city worth the name. The nearest edge is a long way off, so local rules apply throughout.

• Where to Fish on Triangle Lake

  Depth is not on record here, so the bank has to tell you. Read the surface for the wind lane, then fish the edge of it. Look for the band where the shallows give up and the bottom falls away. Open biodiversity records for Boise County list cutthroat trout, rainbow trout, california golden trout and Arctic grayling. Several of these carry legal protection or closed seasons; the rulebook comes before the rod. Triangle Lake gives up its fish to patience rather than distance.

• Seasonal Patterns

  The warmest month averages 53°F, the coldest about 17°F. Winter shuts things down for a spell, then spring reopens them fast. Hard water holds through the cold months, breaking up near late May. The lid tends to go about late May and return around mid November. Right after break-up, and again as the nights sharpen, is when to go. At Triangle Lake the season follows that pattern closely.

• Tackle & Baits

  Our records carry no access rule either way. There is no mapped parking or launch nearby, which keeps numbers down. For the trout, small spinners and a box of nymphs cover both approaches. Gates get locked out of season on water like this. Where parking is tight, arriving early solves most problems. Diamond Lake, 0.2 miles away, makes the obvious fallback. Confirm access to Triangle Lake locally before you travel.