TasLe 50.—Assumed future decadal depletion,’ by district and ownership class 
| 
1933-42 1943-52 1953-62 
Ownership and disrtict ; 
Cutting Other Total Cutting Other Total Cutting Other Total 
, Million Million Million Million Million Million Million Million Million 
National forest: board feet board feet board feet board feet board feet board feet board feet board feet | board feet 
IRUZet SOUDCeeea mee se eae ae 1, 020 1,019 2, 039 1, 950 959 2, 909 3, 000 773 3, 773 
Grayseelarboreese tee eee eas see 250 224 474 1, 000 204 1, 204 1, 500 170 1, 670 
ColumbiatRivers= =e see 250 431 681 400 420 820 800 358 1, 158 
\WillamettevRiver2oss-—-——--2---— 450 357 807 1, 150 344 1, 494 2, 250 325 2, 575 
Oregon\coastiaasees= seen eee 50 133 183 80 132 212 105 122 227 
SouthiOreconsseese = =e 125 253 378 400 255 655 650 242 892 
Ota are ee es eS aS 2,145 2,417 4, 562 4, 980 2, 314 7, 294 8, 305 1, 990 | 10, 295 
Other ownerships: | 
Buget Sound eee eee 26, 800 835 27, 635 25, 350 394 25, 744 | 12, 600 284 12, 884 
Graystbiar bores eaene ae eee a 8, 980 332 9, 312 8, 000 218 8, 218 | 10, 000 132 10, 132 
Columbia Rivernts ss se. 2 22 17, 400 612 18, 012 15, 500 139 15, 639 4, 000 143 4, 143 
\WillametteyRivers22sseere ses) T= 7, 200 1, 228 8, 428 13, 000 767 13, 767 14, 000 460 14, 460 
@regonicoas teeta eee eee 6, 600 942 7, 542 11, 300 597 11, 897 14, 000 387 15, 387 
SouthiOregon "sss ees = ase - 875 1, 121 1, 996 1, 870 1,121 2, 991 6, 095 989 | 7, O84 
Ue eee 67, 855 5, 070 72, 925 75, 020 3, 236 78, 256 61, 695 2, 395 64, 090 
All ownerships: 
Puget Sound__ 27, 820 1, 854 29, 674 27, 300 1, 353 28, 653 15, 600 1, 057 16, 657 
GraysiHarborsss-2s=— 9, 230 556 9, 786 9, 000 422 9, 422 11, 500 302 11, 802 
ColumbiajRivers==2 22 2=- 2". =. 17, 650 1, 043 18, 693 15, 900 559 16, 459 4, 800 501 5, 301 
Willamette River_______--___- 2 7, 650 | 1, 585 9, 235 14, 150 1,111 15, 261 16, 250 785 17, 035 
@regontcoast=s== estes et ee ae 6, 650 1,075 7, 725 11, 380 729 12, 109 15, 105 509 15, 614 
South Oregon 1, 000 1, 374 2, 374 2, 270 1, 376 3, 646 6, 745 1, 231 7, 976 
BOY MS a ey pep ae 70, 000 7, 487 77, 487 80, 000 5, 550, 85, 550 70, 000 4,385 | 74, 385 
1 Figures given are log scale, based on Scribner rule. 
TasBLe 51.—Rates 1! used in calculating potential growth of conifer 
timber, approximate technical rotation ages 
Trees 3.1+inches | Trees 15.1+inches | Trees 11.1+inches 
dvb-h? d. b. h.? d. b. hs 
Site- 
quality 
class Mean Mean Mean 
annual Rota- annual Rota- annual Rota- 
growth | tion age | growth | tion age} growth | tion age 
per acre per acre per acre 
Cubic Board Board : 
feet Years feet | Years feet Years 
if 155 | 60 or 70 675 100 875 90 
II 135 | 60 or 70 500 120 675 100 
Ill 105 | 60 or 70 300 150 475 110 
IV 75 | 60 or 70 125 180 275 130 
V 45 | 60 or 70 30 +200 100 150 
VI 208 60lOrs 70g) meen eres 2 2s be es aa Cee eee a |e2 oe eee 
1 Approximately 75 percent of mean annual growth rates of normally 
stocked stands of Douglas-fir in western Oregon and western Washington. 
The normal rates for site classes I to V appear in Technical Bu'letin 201 
(12). The rate for class VI was derived by extrapolation. No allowance 
is made for breakage and defect. 
2 Estimated by Scribner rule in 32-foot logs to 12-inch top. 
3 Estimated by Scribner rule in 16-foot logs to 8-inch top. 
161 
