Unfortunately I found a manhole cover on Thursday. There is two drives I have that only have a base layer of asphalt down. Each one has 3 manhole covers about 1 inch above the level of the asphalt. I complained about them this fall when I saw the problems they were going to present. The project manager had the Asphalt company come in and ramp around them all. I don't think they used any tackcoat because after the first time I plowed half of them had the asphalt tear up around the manhole covers. I just had to be careful after that. But after a 3 week stretch of no snow I forgot about one of them. I wasn't going very fast, but fast enough to tweek my one cutting edge. (I was in the scoop position and only hit one side) Luckily the cutting edge took most of the damage. It ever so slightly tweeked that side of the plow. Also I was lucky that these cutting edges were almost wore out and I had a new set in the garage. I have been checking my center pivot (thanks to your guy's heads up) all year. Well this manhole cover was enough to crack the weld on the bottom pivot point. It could have been worse, but it sure ruined my day.