It was good news to see that the Minnesota River now has more oxygen and is therefore cleaner and supporting more aquatic life ("The muddy Minnesota comes back to life," Nov. 13). I hope this is so, but my personal experience is a little different. For 38 years, I have been taking water clarity readings in Minnesota lakes. Eight years ago, I started taking readings in the Minnesota River and in the water that drains out of Black Dog Lake into the river in Burnsville. The river water is the dirtiest river water in Minnesota, and the water coming out of Black Dog Lake is even dirtier. Over that eight-year span, I have not seen any improvement in clarity. My observations are unscientific efforts by a volunteer for the Minnesota Pollution Control Agency, but it is still disturbing to see that the river water is as dirty as it is. We still have a long way to go before the Minnesota River is clean enough for us to be proud that it bears our state's name.