Basalt Bird Bath Dish 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.
