Height-diameter equations for seventeen tree species in southwest Oregon

Equations for predicting total height as a function of diameter at breast height are presented for 17 tree species from southwest Oregon. Because basal area and site index often influence tree height, additional equations are presented which may include either or both of these as independent variables. Equation coefficients were estimated with weighted nonlinear regression techniques and validated on an independent data set. When tree heights are not measured in stand exams or inventories, these equations are useful for estimating height or, indirectly, height growth.