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The city couldn’t specify a particular brand of riser. Instead, Milwaukee wrote specifications for riser use that required adjustable risers with a mechanism similar to the pivoted turnbuckle. That was about four years ago, and the results have been good. “At the very beginning we faced some resistance from contractors, who were used to the readily available cast iron risers,” Amin says. “But really, that went away quickly, and now nobody mentions it.” City crews also install American Highway Products’ risers, including the firm’s catch basin risers, and keep about a hundred risers in inventory for use as needed.
Costs didn’t go up. “Risers aren’t really a big item in most of our mill and fill bids, and I didn’t notice any significant increase in costs due to the required use of adjustable risers,” says Amin.
By now, close to a 1,000 are installed. Milwaukee has emphasized milling and repaving in recent years, and Amin estimates that between 2-300 risers are installed annually. And in all that time, none have rattled out, or failed in any way.
“They’re a successful product, and we’re very happy with them,” says Amin. “They cost a bit more compared to cast iron risers, but now we have no worries about them coming loose, and that means a lot.”
Angus W. Stocking, L.S. is a licensed land surveyor who has been writing about infrastructure since 2002.