Trout Bible

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TroutBible

Live USGS River Intelligence

USGS NWIS · Real-Time Data

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River Filter

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River Gauges

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Conditions Key

PrimeStable, ideal flow — fish are active

FairFishable, slight variation from normal

PoorBlown out, too low, or unsafe wading

Reading Flow

CFS (cubic feet per second) shows how much water is moving. Trout stack in predictable lies at moderate flows. Rising water pushes fish to margins; falling concentrates them in deep pools. Watch the sparkline trend.

Target Species

Rainbow Trout50–65°F

Brown Trout55–67°F

Brook Trout45–60°F

Cutthroat Trout48–63°F

Angler's Tip

✦ Field Note

When streamflows are elevated and off-color, size up your flies. Large nymphs and streamers push more water and are easier for trout to locate in murky conditions.

Data Source

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USGS National Water Information System. Gauges update every 15–60 min. Click any card to view full gauge data.

Trout Bible — Brown Trout Intelligence Service Data: USGS NWIS · waterservices.usgs.gov