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We can. One presumes it is less efficient than just removing the dam. It is more work versus less work - fish ladders and the like.

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Not only that, but a lot of these dams are not even in use any more, so doing additional work doesn't make much sense. Remove the dam, remove the problem, instead of duct tape solutions.

Fisherman like them because fish bunch up beneath them. Despite the overall populations being higher once all the dams are gone.

There is an aspect of property value as well - dams maintain a certain river level and removal may impact how nice people's river houses are. (Source: Dam near me partly removed, turned into a kayak course.)

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