ARM 42.20.715. FOREST SITE PRODUCTIVITY CLASSES

(1) The department shall assign all forest land to one of the following forest site productivity class designations: (a) forest site productivity class IV (25 through 44.9 cubic feet of wood per acre per year) ; (b) forest site productivity class III (45 through 64.9 cubic feet of wood per acre per year) ; (c) forest site productivity class II (65 through 84.9 cubic feet of wood per acre per year) ; (d) forest site productivity class I (85 and over cubic feet of wood per acre per year) .