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Cochran, P.H.; Barrett, James W. 1999 . Growth of ponderosa pine thinned to different stocking levels in central Oregon: 30-year results. Res. Pap. PNW-RP508. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 27 p. No mortality occurred at the lowest growing stock level (GSL) during any of the six 5-year periods of study. After the first period, plot mortality never exceeded two trees per acre for any 5-year period where stand density index values were below 240 at the start of the period. All mortality was attributed to mountain pine beetles (Dendroctonus ponderosae Hopkins). Pandora moth (Coloradia pandora Blake) caused partial defoliation during 1992 and 1994, which reduced growth rates in the last period (1991-95). Periodic annual increments for survivor quadratic mean diameters decreased curvilinearly with increasing GSLs, and the survivor height PAI-GSL relation varied with period. Gross volume and basal area PAIs increased linearly with increasing GSLs. Gross basal area PAI and 30-year mean annual growth rates increased with increasing GSLs, but a significant curvilinear relation was not detected. Scribner board-foot yields at a stand age of 95 years increased linearly with increasing GSLs, while corresponding cubic-volume yields increased with increasing GSLs only if the initial thinnings were excluded. Mean annual increments (MAIs) for cubic volume increased with increasing stand age for all GSLs only if the initial thinning was excluded. Boardfoot MAIs, with and without inclusion of initial thinning, increased with increasing stand age and with increasing GSLs. Mean annual growth of basal area and cubic volume for the 20 trees per acre with the largest diameters at the start of the study decreased curvilinearly with increasing GSLs. Increased periodic thinning levels greatly increased average tree size and reduced basal area and volume growth rates per acre.