CNN PRODUCER NOTE Mary Wallace has lived in Plymouth, Massachusetts, for 20 years and she is concerned about the well-being of local wildlife. Town Brook is a 1.5-mile stream that's home to migrating river herring. When dams were built on the brook in the 1790s, the number of fish decreased, according to NOAA. "Town Brook is a great story of a waterway gone bad and restored to its original state," she said."Industry dammed the water and prevented fish from entering Billington Sea. Now with the removal of dams, fish are returning and thriving."
- zdan, CNN iReport producer