...local or close to Yorba Linda (Orange County). Specifically, a place which I can do 20 minute intervals without interruption from rolling terrain and stop signs. This stretch of road may have uninterrupted climbing--preferably around the 3-4% gradient range--or be pancake flat.
Lately I've been doing my 20 min intervals on the SART, but I feel the slight power rises underneath the street overpasses are messing up with my pacing and consequently I'm not giving it my best effort. I guess Santiago Canyon is another stretch of road that's pretty local--it might be best to take it from the north side towards the south for extended uninterrupted climbing. I'm not sure.
Silverado Canyon is about 20 minutes flat when done at interval pace. Not stopping and has a steady grade, it does get steeper and stair steps at the top. There's always SART, but I don't like being the jack ass weaving through recreational riders and walkers at 25 mph.