Until this year, I didn’t realize how strongly I felt about NOT swimming in the Charles River. I knew it had been horribly polluted in the past and I knew (thanks to a friendly duck boat driver!) that in recent years it has gotten much cleaner. A certain kind of duck is back, meaning a certain kind of fish is back, meaning pollution levels are not where they used to be. Great! But still, it’s hard not to think of the Charles as kind of gross – it runs through a major city and has large, multi-laned roads on either side, but, maybe most importantly, the Standells’ “Dirty Water” is played frequently and sung along to enthusiastically throughout the bars, stadiums, and streets of the city. Since I first moved to the Boston area in 2004, I’ve been singing about that dirty water, meaning I’ve had 13 years of internalizing the fact that our river may be beloved, but it is best loved from a distance.