Delaware County approves design contract for Lower Big Walnut 48-inch tunnel

May 12, 2025

The Delaware County commissioners approved a professional services agreement with Black & Veatch to design the first phase of a 48-inch trunk sewer intended to connect with a Columbus tunnel, advancing a multi-year regional sewer plan.

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Delaware County commissioners voted unanimously to approve a professional services agreement with Black & Veatch Corporation to design Phase 1 of the Lower Big Walnut trunk sewer, a 48-inch tunnel intended to connect into a City of Columbus tunnel near Harlem and Smothers Road.

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