Got you beat... COS-DEN. 11,900ft max altitude. Which means only 6000ft above the ground.
https://flightaware.com/live/flight/.../KDEN/tracklog
Wish I'd kept the printout from my OAK-SFO flight some years back. Sadly, we didn't get the "skim the bay" but took a normal take-off & landing approach, making a U-turn over San Jose. Probably about 4000ft. At 3am, they probably could have sent us across the bay... :-)