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

The Willimantic River is located in the northeastern United States, running through Connecticut and Massachusetts. With a length of 25 miles, it is a tributary of the Shetucket River and part of the Thames River watershed. Historically, the river was used for transportation and powering mills during the Industrial Revolution. Today, it supports recreational activities such as fishing, kayaking, and hiking. The river's hydrology is influenced by several dams, including the West Thompson Dam and the Eagleville Dam. The reservoirs created by these dams provide water for both municipal and agricultural use. Despite some pollution concerns, efforts have been made to improve the river's water quality and restore its natural habitat.