Cutthroat Rising on the Snake as Spring Runoff Finds Its Exit

What's Biting

What's Next

With USGS gauge 13340000 reading 14,400 cfs and 56°F on June 6, the outlook from here is gradually easing flows as snowmelt contribution slows at elevation — a transition Idaho anglers watch closely because the drop from peak runoff into fishable clarity can happen fast.

Once flows settle and turbidity clears, expect cutthroat and rainbow trout that have been stacked in slower, protected lies to spread back into main-channel runs and tailouts. That's when big nymphs — stonefly and large mayfly imitations — become highly effective fished with enough weight to tick the bottom of deepened channels. Gink and Gasoline's recent nymphing piece makes the case directly: if you're not in contact with the bottom, you're not where the fish are holding in elevated flows.

The green drake hatch should be building on Idaho's freestone rivers through the weekend. Flylords Mag's coverage of matching this hatch highlights the aggressive dry-fly takes it triggers — look for spinner falls in the 10 a.m. to 2 p.m. window on sunny days, earlier on overcast ones. Golden stoneflies are also typical for early June in this watershed and can produce explosive surface action in shallow riffles at dawn and dusk.

On the Salmon River, spring Chinook are the primary draw for anglers willing to work the bigger water. June typically represents the tail end of the spring run, with late fish pushing into upper tributaries as main-stem temps climb. Back-trolling or anchoring through known holding pools is the classic approach. Confirm current regulations on Chinook retention before you go — hatchery vs. wild rules vary by reach and can change mid-season.

For weekend planning: if flows continue their expected decline through Saturday, Sunday could be the strongest cutthroat day of the stretch on the upper Snake. Watch for afternoon convection — early June thunderstorms over the Rockies can cloud smaller tributaries quickly even when the main stem is clearing. A Last Quarter moon this weekend favors low-light feeding windows at dawn and dusk, which lines up well with both stonefly activity and the morning dry-fly bite.

Context

A mid-50s water temp on June 6 falls right in line with historical norms for the Snake and Salmon River drainages at the end of the spring runoff window. Idaho's major river systems typically exit peak snowmelt in late May through mid-June, and the 56°F reading from USGS gauge 13340000 suggests this year is tracking on schedule — not the early-season dropout you'd expect after a light snowpack year, and not the prolonged high-water siege of a heavy one.

The Teton Dam context is worth knowing for any angler newer to this watershed. Hatch Magazine's current feature marks 50 years since the dam's catastrophic failure on June 5, 1976, which reshaped the upper Snake River's morphology and altered the fishery significantly. The river has largely recovered in the decades since, and Trout Unlimited's ongoing habitat work — underscored in their recent Spread Creek video — reflects how resilient the native Snake River cutthroat population has become through sustained conservation effort.

For the Salmon River, June represents the historical bookend of the spring Chinook run. The peak typically falls in May; early June fish pushing upriver are often late-run hatchery fish mixed with wild Chinook holding in canyon pools before their final push to spawning grounds. Trout Unlimited also notes that Upper Snake water availability is again under discussion as potential Teton Dam rebuilding options are studied — a dynamic worth watching for anyone tracking long-term river health in this basin.

Direct angler intel from Snake and Salmon River guides or local tackle shops was not available in this reporting cycle. The conditions picture here is grounded in gauge data and broader regional feeds; a call to a local outfitter before making the drive is strongly recommended.