Yes, salmon have adapted to jumping up small waterfalls to make it to their spawning grounds. You may have seen videos or images of grizzly bears leaning over a waterfall to catch salmon jumping up. Salmon have incredible bursts of speed which allow them to make it up fish ladders, which are usually in one or two foot increment steps. Un-dammed rivers often require even higher jumps for the salmon. Salmon are well adapted to moving up stream, so fish ladders are a viable way for them to make it around dams to their spawning grounds.
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