FENTON RIVER, Mansfield-Willington Intermittent sections from Route 74 to Mansfield Hollow Reservoir. WILD TROUT MANAGEMENT AREA (Class 3) Entire stream in Mansfield and Willington: Trout: 9” Minimum length. In early September 2005, a about a 1/4 mile stretch of the Fenton River ran dry.Due to the dry out Water Conservation Efforts plan was to Re-stock 1000 catch-able size brown trout in the Fenton River in Spring 2006 In early September 2005, a about a 1/4 mile stretch of the Fenton River ran dry.They also proposed greater public access on University of Conn-owned property for fishing along the Fenton River, including conservation and public access easements in favor of DEP as grantee (including access to sites in the Fenton Forest Tract/East campus and Moss Tract/Willington).