Moose McClennan turned his head to see who was calling him. It was his neighbor’s 4-year-old son. “There are goldfish in the pond!” The chef at Stafford Hill Assisted Living smiled at the idea.

Through the winter we have watched the excavators dredging muck from the bed of Rosemary Lake, removing some of the pollutants that have filtered in over the years (decades? centuries?). Earlier in ...