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Keller Associates recommends Site 2 as top choice for St. Helens reservoir; council raises wetlands and neighborhood concerns
Summary
Keller Associates presented a reservoir siting study for St. Helens and recommended Site 2 as the preferred alternative for cost and constructability, while councilors expressed concerns about wetlands mitigation, haul routes through subdivisions and long‑term hydraulic performance.
Keller Associates briefed the St. Helens city council on a reservoir siting study on Dec. 17, describing a multi‑phase evaluation that narrowed 11 initial locations to four finalists and ultimately recommended Site 2 based on cost, constructability and system connection length.
Consultant Alexis said the selection considered hydraulic pressure zones, pipeline connections, overflow/drain routing and geotechnical constraints. Field borings and lab testing showed basalt at Site 2 — a geologic condition the team described as…
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