Maximum discharge along the river was observed at the North Santiam River At Mehama with a streamflow rate of 1,690 cfs. However, the deepest point on the river is located at the North Santiam River Near Jefferson reporting a gauge stage of 14.49 ft. This river is monitored from 3 different streamgauging stations along the North Santiam River, the highest being perched at an elevation of 1,103 ft, the North Santiam River At Niagara.