Snake River At Lorenzo
Snake River · Rockies · USGS gage 13038500
Trout (marginal) (summer mean 16.7°C — trout, warm in summer).
Water
60°F
Flow
3,200 cfs
Air
47°F
Sky
0%
Pressure
30.03 in
Wind
5 mph
Predicted hatches · 2026-09-15
PredictedSlate Drake / IsonychiaIsonychia spp.0.75
Predicted by conditions; no reports yet. water 15.5°C (60°F) is warming toward the prime band (16-21°C); peak season; watch afternoon/evening; nymphs crawl to shore to emerge.
flies: Isonychia #10-12, Slate Drake, Leadwing Coachman
PredictedSpotted / Summer CaddisHydropsyche spp.0.50
Predicted by conditions; no reports yet. water 15.5°C (60°F) sits in the prime band (14-19°C); shoulder of the season; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedTricoTricorythodes spp.0.25
water 15.5°C (60°F) is warming toward the prime band (16-21°C); shoulder of the season; watch early morning spinner falls.
flies: Trico Spinner #20-24, CDC Trico, Griffith's Gnat
PredictedHopper / TerrestrialsAcrididae (grasshoppers)0.25
water 15.5°C (60°F) is warming toward the prime band (17-24°C); shoulder of the season; watch warm, breezy afternoons.
flies: Morrish Hopper #8-12, Chubby Chernobyl, Dave's Hopper
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.