Table 66. 



(Page 2) M.A.I. Site Class 



Species Group: (ft^/acre/year) 



Western larch, 20-49 50-84 85+ 



Ponderosa pine years 



Diameter Class Age Range Age Range Age Range 



1.0 - 2.9* 49 21- 70 40 21- 60 35 31- 40 



3.0 - 4.9 64 31- 90 51 21- 80 - - 



5.0 - 6.9 69 41-140 68 21-120 



7.0 - 8.9 78 31-150 69 21-110 



9.0 - 10.9 82 31-160 86 41-180 



11.0 - 12.9 92 41-200 93 41-180 



13.0 - 14.9 117 51-200 99 31-200 



15.0 - 16.9 130 41-200 90 51-200 



17.0 - 18.9 142 61-200 119 71-200 



19.0 - 20.9 145 81-200 127 61-200 



21.0 - 22.9 172 71-200** 150 61-200 



23.0 - 24.9 172 141-200** 136 71-200** 



25.0 - 26.9 193 181-200** 161 81-200** 



27.0 - 28.9 195 191-200** 182 121-200** 



29.0 - 30.9 168 121-200** 182 151-200** 



31.0 - 32.9 195 191-200** 175 171-180** 



33.0 - 34.9 195 191-200** 



35.0 - 36.9 - - 195 191-200** 



37.0 - 38.9 - - - - 



39.0+ 195 191-200** 195 191-200** 



Species Group: Subalpine fir. Spruce 



1.0 - 2.9* 56 31-100 69 41-140 105 61-150** 



3.0 - 4.9 57 31- 80 63 31-100 79 51- 90** 



5.0 - 6.9 71 41-190 84 41-190 136 41-200** 



7.0 - 8,9 87 51-200 99 51-200 148 41-200** 



9.0 - 10.9 116 61-200 112 61-200 112 51-200** 



11.0 - 12.9 154 91-200 118 61-180 158 81-200** 



13.0 - 14.9 116 71-190** 121 61-200 176 51-200** 



15.0 - 16.9 169 141-200** 143 81-200 170 51-200** 



17.0 - 18.9 195 191-200** 161 91-200 171 91-200** 



19.0 - 20.9 195 191-200** 159 91-200 195 191-200** 



21.0 - 22.9 195 191-200** 179 91-200** 195 191-200** 



23.0 - 24.9 - - 170 141-200** 



25.0 - 26.9 185 181-190** 191 171-200** 195 191-200** 



27.0 - 28.9 - - 195 191-200** 85 81- 90** 



29.0 - 30.9 - - 195 191-200** 



31.0 - 32.9 - - - - - - 



33.0 - 34.9 - - 195 191-200** 



35.0 - 36.9 - - - - - - 



37.0 - 38.9 - - - - - - 



39.0+ - - 195 191-200** 



*Ages recorded for the 2 inch diameter class are total tree ages. All other 



diameter classes have d.b.h. age recorded for them. 

 **Indicates a very small sample is responsible for the estimates. 



-135- 



