The other problem is the fish need to go downriver too. The dam extracts energy from the water flow and slows down the river - making it difficult for newly hatched salmon to even get to the ocean in the first place.

The dams simply need to be removed, starting with the ones that offer minimal value in other dimensions (electricity, water supply, navigable waters, recreation, etc...) until eventually the vast majority are gone and only a few are left to protect important infrastructure that cannot feasibly be moved.