Our local river was recently very low. I think it was the lowest in 112 years of record keeping. Check out the chart. It was down to about 200 cubic feet per second (cfs). The triangles show the average is a bit over 1000 cfs. It was so clear and low you could see all the rocks and fish and turtles and tires and shopping carts in the river. I developed a fantasy to walk across the river since it was so low. I waited too long though and the remnants of Hurricane Fay came through and brought a lot of rain. In about 36 hours, the flow went from less than 200 to over 8000 cfs. I should have walked when I had the chance.