River Fishable-Flow Bands — 20 Western Trout Rivers, USGS Gage IDs & Cited Thresholds (2026)

Fishable-flow-band data for 20 western North American trout rivers: the USGS real-time streamflow gage that measures each river, and the discharge thresholds (cfs) that separate low/skinny, fishable, prime, and blown-out/off-color conditions. Each threshold is cited to guide-service or outfitter flow guidance, cross-checked against the gage's own historical percentile record. Compiled and maintained by Best Time to Fish (besttimetofish.com) — live USGS flow scored against these bands for a real-time fishability verdict. Full site: https://besttimetofish.com/.