Idaho fishing reports
51 reports for Idaho — what's biting, water temps, and where to focus.
Snake River at 11,300 cfs — Cutthroat Stack in Eddies and Seams
USGS gauge 13037500 put the Snake River at 11,300 cfs Sunday morning — a strong early-May runoff pulse that defines the fishing strategy on both the South Fork and mainstem. No local tackle-shop, charter, or state-agency reports were in our intel feed this cycle, so conditions here are grounded in the gauge reading and seasonal patterns typical for this drainage. With water this high, the fine-spotted cutthroat that make the South Fork famous have pushed entirely out of midchannel and are holding in bankside slacks, foam lines, and protected eddies. Water temperature was unavailable from the gauge at publication time. Field & Stream's current aquatic-insect primer is a timely reminder that stoneflies, caddisflies, and mayflies drive a trout's subsurface diet — on high-water South Fork days, a heavy stonefly nymph drifted tight to the seam where fast and slow water converge is typically the most productive approach. With a full moon tonight, plan your sessions around the dawn and dusk feeding windows.
Snake River Running 52°F, 16,100 cfs as Spring Chinook Season Peaks
USGS gauge 13340000 logged the Snake River at 52°F and 16,100 cfs early Sunday morning — conditions that place anglers squarely in the heart of the spring Chinook migration window on the Snake-Salmon corridor. At these flows the river is elevated but fishable, and 52°F sits in the temperature band that keeps spring kings actively on the move. No Idaho-specific charter or tackle-shop reports surfaced in this cycle's feeds, so species assessments here blend gauge data with seasonal patterns typical for early May in the region. Field & Stream's current guide to aquatic insects is timely context: stonefly and caddisfly activity on Idaho rivers historically ramps up right around 50–54°F, making drift nymphing and emerging-caddis presentations productive for resident rainbow and cutthroat trout on side-channels. A full moon this weekend typically compresses active feeding into low-light windows — plan your launch times around dawn and dusk rather than midday.
Snake River at 47°F and 15,700 cfs: Spring Chinook Window Aligns
The USGS gauge at site 13340000 logged the Snake River at 15,700 cfs and 47°F as of the 5:15 AM reading on April 29 — water temperatures that sit squarely in the productive strike zone for spring Chinook salmon and late-season steelhead pushing through the Snake and Salmon River corridors. Flows are elevated and consistent with the late-April snowmelt pulse off the upper Snake plain; expect lightly turbid conditions in faster gradient reaches, which will push fish toward current seams, back-eddies, and slack inside bends where they can hold without burning energy against the push. No Idaho-specific catch reports surfaced in this cycle's angler feeds, so current bite accounts should be drawn from local contacts on the water. The waxing gibbous moon favors the low-light feeding windows at dawn and dusk. Verify wild fish retention rules and any reach-specific closures with IDFG before harvesting — spring Chinook regulations on the Snake and Salmon systems are reach-specific and change year to year.