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City releases CMT water‑tower study recommending 750,000‑gallon tank; council shown $7–8 million estimate
Summary
City Manager Chris Lohr told council Sept. 9 that a CMT water‑tower site and system study recommends a roughly 750,000‑gallon tank to meet existing and future demands and estimates total project costs, including mains and construction, in the $7–8 million range; the study itself cost about $30,000–$35,000.
City Manager Chris Lohr briefed Carlisle City Council on Sept. 9 that a site and system study completed by engineering firm CMT recommends a roughly 750,000‑gallon water tank to meet current and projected demand and that the total project — including water mains and construction — could be in the $7–8 million range.
Lohr told council the CMT study cost approximately $30,000–$35,000. He said earlier planning in 2022 estimated a much smaller tank (about 250,000 gallons) but that updated hydraulic modeling indicates a substantially larger tank is needed to provide adequate flow for existing customers and anticipated growth. Lohr said the team considered multiple tank styles and locations; no final design or site was chosen at the meeting.
Lohr described cost drivers including main extension length, tank construction and site work, and acknowledged repainting and long‑term maintenance costs for a steel tank. He also said potential new development could share the cost of mains or other on‑site infrastructure, which could reduce Carlisle's net expense.
Council asked questions about height and elevation needed to achieve design pressure; Lohr said the rule of thumb used in study modeling was enough elevation to provide 70 psi to the school building but did not provide a final tower height. Lohr characterized the cost estimate as a high‑level planning number; the study provides a basis for future design and funding discussions.
Council did not commit to a timeline for construction at the Sept. 9 meeting; staff said they will distribute the CMT report and a summary to council for further review.
