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Thunder Bay River (Michigan) — a popular fishing spot. About 125 km long. Flows into Thunder Bay. A smart bite calendar — moon phase, atmospheric pressure, and weather combined into an hourly fish-activity forecast for the coming days.
Partly cloudy: 59–77 °F
Recorded 9 catches here. Most commonly caught: Smallmouth bass, Largemouth bass, Brown trout. Peak season: February–July.
Thursday, September 3
The bite is moderate — fish feed in short bursts. Weather is steady, with no sharp swings — fish behave predictably.
Best time — 06:00–08:00 (dawn bite) and 19:00–21:00 (dusk bite).
Work the cover — snags, weed edges, hole entrances; retrieve the lure with pauses.
In clear water, natural colors work best: small jig or minnow bait.
It's a hot day — a hat, sunglasses, and plenty of water are a must.
An average day — best chances during peak windows.
The computed water temperature is around 67 °F — inside the 57–75 °F comfort range for Black crappie, so baseline activity is high.
Black crappie works the twilight: the peaks are pinned to sunrise and sunset — their times are in the sun-and-moon card above.
Pressure is rising 0.06 inHg over the day — the bite usually settles down after a rise.
One more input — the moon's feeding windows: within their hours the score sits higher than across the rest of the day. The window times are in the “Solunar feeding periods” card below.
September is an active season for Black crappie here.
These are the same values the bite curve above was computed from. How the forecast works
Cloudy · feels like +75°
The day is 3 min shorter than yesterday.
Sunshine hours count direct sun only — cloud cover cuts it, so it is shorter than daylight.
The windows are set by the moon's transit and rise, and the forecast above already accounts for them: within these hours the bite score sits higher than across the rest of the day, while the day's overall level still comes from the catch-calibrated model.
What are solunar periods?BiteGuideFrom anglers’ reports
This is a summary of anglers' reports, not a proven cause of the bite: conditions lining up does not mean they drove it.
vertical axis — number of catches
| Value | Catches | Share |
|---|---|---|
| Smallmouth bass | 5 | 56% |
| Largemouth bass | 2 | 22% |
| Brown trout | 1 | 11% |
| Steelhead | 1 | 11% |
Measured river conditions are available for Thunder Bay River: current gauge height, streamflow, and water temperature when reported by the source.
USGS gauge THUNDER BAY RIVER AT HERRON ROAD NEAR BOLTON, MI, 18 mi away · measured 2026-09-02 23:30 · data source · provisional data, subject to revision