Live Trout Fishing Conditions & River Reports
TroutBible is a free fly fishing planning and conditions tool built for trout anglers across the United States. We combine live USGS streamflow data, real-time weather forecasts, and AI-assisted fishing reports to give you accurate, actionable intel before you head to the water.
Our reports cover fly recommendations, seasonal hatch timing, wadeability ratings, gear setup, current flow conditions, and technique tips — for over 100 trout rivers nationwide including named sections like South Platte — Cheesman Canyon, Madison River — Upper, Henry's Fork — Railroad Ranch, and more.
Flow data is pulled directly from the USGS National Water Information System (NWIS), updated every 15 to 60 minutes. Weather forecasts come from Open-Meteo, a free and open weather API. Fishing reports are generated using Claude, Anthropic's AI model, which combines current flow conditions, seasonal hatch data, and river-specific knowledge to produce each report.
TroutBible was built by Anson, an angler with over a decade of fly fishing experience across trout rivers throughout the American West and beyond. The idea came from a simple frustration: planning a trip required checking USGS for flows, a weather app for forecasts, a hatch chart, fly shop reports, and a regulations page — five tabs, every single trip. There had to be a better way.
The fly recommendations, hatch timing, and river-specific intelligence in every TroutBible report reflect years of on-the-water knowledge — knowing when Blue-Winged Olives, Caddis, or Salmonflies are hatching on our beautiful rivers, and what that means for the angler standing in the water that day. The report synthesizes that knowledge with live USGS flow data and real-time weather to produce something no single source could on its own. Anson continues to refine and expand that intelligence on an ongoing basis, keeping every detail as accurate and current as possible.
TroutBible is free because that's how the fly fishing community has always worked — guides share knowledge, fly shops post conditions, anglers compare notes at the takeout. TroutBible is an extension of that culture.
TroutBible includes a Local Reports section where anglers can submit field reports directly from the water. These reports are reviewed for quality and appear on the site to give other anglers real-time intel from people who were actually there.
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