It's an 18 mile loop around Arlington, Winchester and Woburn with 1800ft of climbing.....a fair amount is above 10%. It's a good way to get a quick workout if you are in the area.
NEBC Wednesday Night Hill Ride at Bikely.com
nun, just to provide some contrast to your excellent ride from southwest MetroBoston, my ride today was 23 miles at 13 mph and according to my phone app 984 feet of climbing. It could easily have been half that climbing because a fair amount was weaving around back roads along the Charles River flood plain in Millis and Medfield. No photos but the flood plain is all shades of gold, brown, red and the oak's resilient dark greens.