This study analyzes four pollutants. Turbidity measures the effect of soil runoff. Fecal coliform measures the effect of cattle manure contamination. The trends in pollution levels are much more ambiguous than the recreation trends. This study analyzes the effect of the four pollutants on recreational activity.
Acidity levels have a lesser effect on fishing.
Dissolved oxygen has some effect on both boating and on total visitation. This study analyzes the effects of potential increases in pollution levels. That represents a lower overall pollution level, since there are strong annual cycles. This study describes the political orientation of the region, based on interviews with representatives from all the relevant parties. In choosing a policy option to deal with BNR pollution, private and voluntary means are preferable because of the prevalent anti-government orientation.