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City staff propose buying adjustable manhole risers to reduce street 'potholes' at rims
Summary
Public works asked council to authorize purchase of adjustable manhole-frame-and-riser assemblies (about $500 each) to replace worn or low manhole frames on steeper streets, improving ride quality and reducing frequent repairs to grout-set rims.
Public works staff asked the City Council for authorization to buy adjustable manhole rim systems to address recurring low or loose manhole covers on steep streets such as Oak Street and at the Ash–Newmark intersection.
Staff said typical standard frames and grates cost about $300 each, while adjustable rim systems average a little over $500 each. The department described a maintenance problem: crews set some manhole frames with grout to match asphalt grade, but the grout can fail and manholes can settle or become loose, creating what staff called “purposeful potholes” that drivers avoid. Adjustable risers allow crews to set and later adjust the rim to grade without repeated grout repairs.
The public works presenter said the city intends to replace problem frames and covers in targeted areas to reduce bumps and improve street surface consistency. Staff characterized the adjustable assemblies as somewhat more expensive up front but expected they would reduce recurring repair work and improve driving conditions. No formal council action was taken during the work session; staff said the purchase would appear on the upcoming council agenda.
