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

The Mahwah River, located in the northern part of New Jersey, stretches for approximately 18 miles. The river has a rich history and was once used as a water source for local communities. Today, there are several reservoirs and dams along the river, including the Ramapo Lake Dam and the Darlington Dam, which are used for flood control and to maintain water supply. In terms of hydrology, the Mahwah River is a tributary of the Ramapo River and eventually flows into the Hudson River. The river is also used for recreational activities, such as fishing and kayaking, and supports local agriculture by providing irrigation for nearby farms.