My city removed a few low head dams near the center of the city over the last decade. We are still in the process of a major reworking of the sewer system (to the tune of a few billion dollars) to separate wastewater from storm water due to EPA regulations. Because untreated wastewater is no longer flowing into the rivers, one thing we found is that we didn't need so many low head dams to keep incision from occurring as much.

This improved our downtown as it allowed us to also alter the river channel and opening up some land to build new parks on. Paddle boaters can travel much further, and the river ecology is improving drastically.