Live Hatch Forecast
Real-time emergence predictions powered by 10 years of USGS water temperature data and Growing Degree Day analysis.
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| River | Hendrickson | Mother's Day Caddis | PMD | Green Drake | Brown Drake | Salmonfly | Trico | Hex |
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How This Works
Predictions are powered by Growing Degree Day (GDD) analysis — accumulated daily water temperatures from USGS gauges, calibrated against 10 years of fishing reports. Updated daily.