But this year, Costa said, he's been seeing some of the lowest flow rates on the river he can ever recall. "The river finds its way lower and lower and lower," Costa said. "In fact, to the point that as low as it is now, I won't even fish it. Because the fish are too stressed, and they're in oxygen debt." What's happening in this section of the Oldman River comes as no surprise, experts say, and the effects of climate change could lead to water shortages across Alberta in years to come.