Portneuf River

A 117-mile river tributary of the Snake River in southeastern Idaho. Excellent brown trout, cutthroat, and rainbow fishing. Regularly stocked throughout the year. Features camping, toilets, and ADA access at multiple locations.

Species: Brown Trout, Cutthroat Trout, Rainbow Trout. Difficulty: beginner. Approachable for first-timers and families.

Best timing: Spring and Summer and Fall. Spring fishing keys on warming water and emerging insects. Summer fishes best at first light and late evening; midday is technical. Fall is prime — heavy feeding before winter, fewer crowds.

Regulations: Southeast Region Bag Limits. Trout limit 6, only 2 may be Cutthroat in streams. Always confirm with the current IDFG rule book before fishing.

Southeast context

Southeast Idaho holds the densest concentration of trophy trout water in the state. The Henry's Fork is the marquee fly-fishing river in North America for technical dry-fly fishing; the South Fork of the Snake holds Yellowstone cutthroat-rainbow hybrids; Henrys Lake and Palisades Reservoir produce trophy-sized fish. Driggs, Ashton, Idaho Falls, and Soda Springs are the staging towns.

Plan for the experience level the fishery rewards.