Current Madison River Flows - USGS
The upper Madison River flows are controlled at Hebgen Dam. Madison River flows are highest during the spring runoff as the snow melt is at it's peak. The duration and magnitude of the runoff is determined by the amount of snow we receive each winter. The biggest misconception about spring runoff is that the fishing terrible. This couldn't be further from the truth. We see some extremely productive days during the highest and dirtiest flows. The lowest flows on the Madison River come near the end of summer and middle of winter. Flows under 900 CFS make for some skinny water, but nonetheless, the Madison River stays floatable year-round.