Dunn County approves temporary asphalt plant at Downing Quarry with conditions The Dunn County Board of Adjustment approved Mathey Construction’s request to operate a temporary asphalt plant at the Downing Quarry for the 2026 construction season, voting 5–1. The board attached conditions including production-hour limits (6 a.m.–8 p.m.), required mitigation measures (baghouse, water trucks, odor control), a neighbor point-of‑-

Dunn County has approved a temporary asphalt plant at the Downing Quarry, but with strict conditions to address community concerns about health and noise.

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