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Council approves lining for deteriorated culvert on South Diamond Lake Road; low quote $95,600
Summary
Staff recommended rehabilitating a degraded culvert found during last year’s mill and overlay by using a pipe‑lining method to avoid major road closures; three quotes were received, the low bid was $95,600 and the project (estimated ~$116,800) will be funded from the stormwater fund.
City engineering staff reported that pre‑construction inspections during the 2025 South Diamond Lake Road mill and overlay identified a deteriorated culvert with holes that needs rehabilitation.
Staff said they evaluated full replacement versus a cured‑in‑place lining approach and concluded lining is favorable for cost, schedule and reduced traffic impacts. Three quotes were solicited; the low quote was $95,600 and staff estimated the total project cost would be about $116,800, to be funded from the city’s stormwater fund. Staff recommended awarding to the low bidder and completing the work this summer; council approved the contract award by motion.
Council discussed alternatives including a short full‑excavation replacement that some contractors said could be completed in hours at a much lower cost, but staff explained their cost estimate and permitting history supported the selected approach. The engineering staff noted different lining technologies (thermal versus UV) and that the UV option was offered at lower cost by one contractor but that the city has more experience with thermal methods.
What’s next: Staff will execute the contract with the selected lining contractor and schedule work to minimize traffic impacts during the summer construction season.
