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Experimental and theoretical studies suggest that alternate bars form under large channel width\u2010to\u2010depth ratios, step\u2010pools form in near supercritical flow or when channel width is narrow compared to bed grain size, and cascade morphology is related to debris flows. However, the connection between these process variables and bed slope\u2014the apparent dominant variable for natural stream types\u2014is unclear. Combining field data and theory, we find that certain bed slopes have unique channel morphologies because the process variables covary systematically with bed slope. 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