Bismarck, N.D., maintains 300 lane-miles of paved road, and the paving season is limited; therefore, Supervisor Rod Kudrna is always on the lookout for ways to save time. Ten years ago, he started using manhole risers made by American Highway Products (AHP) and he’s never looked back: “Oh, they save a lot of time and money. The same job would take an hour or more without the risers.”
“They’re real easy to install,” said Kudrna. “We just pop the cover, get the right-size riser in there and tighten her down.” The turnbuckles are adjusted with a screwdriver, and the design allows users to exert thousands of pounds of pressure, quickly adapting the riser to the frame.