Actually that is an interesting point about adding nutrients to the water. I remember reading someplace about all the nutrients carried up river by the salmon and steelhead runs. The dead fish provided nutrients for the upper watersheds and now that the runs are severely reduced or eliminated, especially in Idaho, the lack of nutrients is hurting the fishery.

Of course I don't mean to suggest to drink a six-pack for mother nature, but I don't feel too guilty if I do add to the runoff.