Yep, 29.05 is "my" measurement... but I wouldn't call it official. I do my best, but I'm not getting up every 6 hours to measure lol. If it's just the light stuff, once a day measurement is plenty with me. The stake is at about 13" of depth. I just drove through Randolph yesterday, seems very similar to the naked eye. As Phin mentioned, the big difference is as you head towards Gorham or Jefferson. On this side, it drops off QUICKLY as you go from Twin to Bethlehem, and there are only a couple of inches in Littleton