What a great find. Ok it's been there on the CT/MA border forever and a state park shared by both states since 1906 but we just found it.
Well worth the trip it's just off Rte 272 in North Norfolk CT. The falls are about a 1/2 mile walk from the parking. You can climb behind them or swim in the pool at the bottom. Plenty of trails to hike and not a lot of people. No fancy amenities just an outhouse. Keeps away the riff-raff.
Hope you enjoy it.