Souhegan River Protected Instream Flow

a map of the souhegan river watershedThe upper and lower reaches of the Souhegan River were the subject of a Protected Instream Flow Study between 2005 and 2008. In 2008, NHDES’ Commissioner established the protected instream flow values included in the final report as water quality standards, in accordance with Administrative Rule Env-Wq 1904, which were slightly modified in 2013. The Souhegan River Water Management Plan was completed in 2013. Between 2020 and 2023, Instream Flow Program staff collected environmental data from the Souhegan River to support long-term monitoring of aquatic and riparian ecosystems.

Current Upper Souhegan River Instream Flow Conditions   

Current Lower Souhegan River Instream Flow Conditions  

Real Time Water Data