just guessing your location from your usual fishing spot you mentioned, you're not really that far from Wachusett Reservoir - lots of big fish there. Wachusett has more state record fish than any other freshwater lake in the state, from what I've read. It's closed during the winter, but open from April(if the ice is gone) to the end of November. It's completely UNdeveloped and the state seems to keep a pretty tight clamp on things, so the water should be pristine...
http://www.mass.gov/dfwele/dfw/recreation/locations/wachusett_reservoir.htm