Live now
Fetching live conditions across all rivers…
Real-time hatch forecasting

Know what's hatching
before you leave the house.

Live stream conditions, degree day tracking, and a species-specific scoring model — built for anglers who take hatches seriously. Pick your state to get today's forecast.

Pick your water
MI
Michigan Rivers
Au Sable · Manistee · Pere Marquette · Muskegon · Paint Creek
Legendary cold freestone rivers with some of the most celebrated hatches in the Midwest — Hendricksons, the famous Au Sable Hex, Tricos, and Blue Winged Olives through fall.
Au Sable Holy Water Manistee Pere Marquette Muskegon Paint Creek
Best hatch today
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CO
Colorado Rivers
South Platte · Deckers · Cheesman Canyon · Eleven Mile
Technical South Platte tailwaters where midges and mayflies rule. Gold Medal water, 3,700+ trout per mile, and year-round fishing that rewards precision over power.
Deckers Cheesman Canyon Eleven Mile
Best hatch today
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About the Hatchinator

Built by anglers,
made better by every cast.

The Hatchinator reads live stream conditions, tracks degree day accumulation, and weighs the environmental signals that experienced anglers have relied on for generations — barometric pressure, water temperature, cloud cover, flow stability — and turns them into a daily probability score for each species on each river.

No model knows a river better than the angler who fishes it. Every report you log makes the forecast sharper for everyone who comes after you.

Start forecasting →
Live stream conditions
Real-time flow and water temperature from USGS gauges across Michigan and Colorado, refreshed every 15 minutes.
Species-specific scoring
14 species across two states, each with distinct emergence profiles, degree day thresholds, and time-of-day windows.
Degree day tracking
Seasonal accumulation from January 1st positions each species within its emergence window — not just today's temperature, but where we are in the year.
Community calibration
Angler reports feed directly back into model accuracy. The more we all log, the tighter the predictions become.