Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Mousam River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Mousam River, the highest being situated at an altitude of ft, the .

The Mousam River is a 29-mile-long river in southern Maine that flows from its headwaters in Shapleigh to its mouth at Kennebunkport. The river has a rich history, having served as a source of power for early mills and factories. Today, it is used for recreational activities like fishing, boating, and swimming. The river's hydrology is heavily influenced by precipitation and snowmelt, and it can experience significant flooding during periods of heavy rain. The river is also home to several reservoirs and dams, including the Upper and Lower Mousam Dams, which were built to regulate water flow and generate hydroelectricity. These reservoirs provide drinking water for several communities in the region. Additionally, the river is used for irrigation to support local agriculture.