You can have your water and drink it too. Get your fill of Westchester's Croton Reservoir with three lake crossings: the Putnam Trail Railroad Bridge, the Old Croton Dam (Gate House) Bridge, and the New Croton Dam. Ride also features the car-free Putnam Trail, gorgeous views from a lake shore road, and a visit to the best ice cream north of the Croton River. This is a moderate pace ride; cruising speed will be 12-14 mph. 28 mm (or wider) tires are suggested (there are 2 off-road segments) but road tires are OK too. Bring $ for lunch, $10.75 fare for return train ride from Croton-Harmon, and MTA bike permit. 

Cue sheet: http://roboviva.ninja/roboviva/pdfs/28720842.pdf
RWGPS: https://ridewithgps.com/routes/28720842