Basalt Columns Columbia River Dish Rock Diameter Column Columns Columbia River quarries in Idaho, Oregon, and Washington States are producing North America's best landscape basalt columns. These are the following sizes of the rock: 12" - 16" 16" - 18" 18"+ These premium grade straight 4 and 5-sided large basalt columns are stunning in landscape and waterscapes. Natural basalt columns are a gorgeous complement to any project, whether you're installing a large basalt column placement piece for a commercial, residential, or public works project it simply adds a rich touch to your landscaping setting. We sell basalt columns in various heights, diameters, and shades to suit any application.
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