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Council hears Palouse Basin aquifer feasibility update; study considers Clearwater River diversion
Summary
Mayor Willard updated the council on a Palouse Basin aquifer feasibility study: the lower aquifer is declining about 0.72 feet per year; preliminary results expected late 2026; a diversion near Lewiston with roughly 40 miles of piping and treatment near Moscow is among the options under study to provide an estimated supplemental supply (~10 cfs) for long‑term aquifer stabilization.
Mayor Willard briefed the council on long‑term water‑supply work for the Palouse Basin on March 24, describing ongoing monitoring and a regional feasibility study.
Willard said the basin has been monitored since about 1992 and that the lower aquifer has been declining at an observed rate of about 0.72 feet per year despite existing watering regulations.…
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