The Devil's River is an open river which joins the Idagon before the river enters Canyon Lake. There are no dams to slow or control the flow, and there are no diversions for agriculture. The Devil's River delivers 1 million acre-feet (MAF) in a year. The winter months tend to show average flows while the flows during the Spring runoff are much higher. Flows decline to a low in August and gradually return to average values by November.