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main feature is shallow, retentive, trashy, boxed in. There may or may not play on the fish passage side, it is generally flushy, small and shallow.
At low flows, center-river is a string of rocks. At moderately high flows, its a pour-over that should be avoided.
At flows higher than 5000 cfs, a small mellow wave forms in the middle of a flooded river with no eddy access.