Fly Fishing Stream Conditions Report: Snake River

Period:

Sep 2026Aug 2026Jul 2026Jun 2026May 2026Apr 2026Oct 2025Dec 2019Nov 2011

Report Summary for Sep 2026

This year: On the Snake River, conditions vary depending on the stretch you plan to fish. Below the Jackson Lake Dam, releases have remained steady at 1,990 CFS. Further down in the valley, flows are sitting steady at 5,000 CFS, where water clarity has been clearing up nicely after weeks of heavy rain. Anglers should exercise caution in the valley stretch as the currents are pushy and floats will be fast. Additionally, high afternoon water temperatures in the valley can cause the fishing to go soft, so focusing your efforts on the cooler morning hours is highly recommended to avoid stressing fish. Despite the pushy water, the fishing has been good and is already producing larger fish. Dry-dropper rigs, classic indicator nymph setups, and streamers are the most productive methods. Target pushy currents, seam lines, and bank structures where active fish are holding. Recent hatches include Hecuba, Blue Wing Olives, and grasshoppers. Top dry fly choices include large foam attractors like the Chernobyl Ant in purple, red, or peach. Below the surface, pair your dries with heavy nymphs like Pat's Rubber Legs, a Duracell Jig, or a Perdigon.

Best time of day: Morning

Prior years: No prior years report for this period.

This report combines publicly available data when available with our own analysis to give a comprehensive view of the stream conditions.

Chernobyl Ant fly pattern

Chernobyl Ant

dry
Pat's Rubber Legs  fly pattern

Pat's Rubber Legs

nymph
Double Gonga fly pattern

Double Gonga

baitfish

Monthly water conditions

SNAKE RIVER NR IRWIN ID

This month

6014 CFS

Last month

10728 CFS

Access information

Maintenance work is scheduled for the dirt section of the Wilson Boat Ramp access road with a grader and potentially a roller operating on the unpaved entrance.

Hazards

• Floats are going to be fast and the currents are going to be pushy

• High afternoon water temperatures; stressing fish in high 60s can be fatal.

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