64 



MISC. PUBLICATION" 9 0, U. S. DEPT. OF AGRICULTURE 



duction, called working circles. The growth data are assembled, 



and from them the amount of timber which can be grown per year, 



or the sustained annual yield, is determined. 



All the national forests are being handled on this principle so 



that a permanent industry based on productivity can be estab- 

 lished. What the State's 

 sustained annual yield 

 will be is not of immediate 

 concern so long as the cut 

 remains as low as it is at 

 present. Nevertheless, it 

 is interesting to consider 

 what the forests of Utah 

 may be able to produce. 

 A rough estimate, the best 

 available at present, is 

 given in Table 4 for the 

 national forests of the 

 State. Other areas play 

 little part in timber pro- 

 duction. 



The national forests of 

 Utah can supply around 

 85.000,000 board feet a 

 year, exclusive of that 

 which goes into cordwood, 

 posts, etc. This is more 

 than one-half of the needs 

 of the State for lumber. 

 Under Forest Service 

 management the amount 

 of lumber produced an- 

 nually will increase, par- 

 ticularly in the forests 

 close to the cities and 

 towns which were cut 



heavily in the early days and which now with proper protection are 



reproducing and growing rapidly. 



Figure 34. — How old is the tree? How fast does 

 it grow? Answering these questions with an 

 increment borer 



Table 4. — Amount of timber expressed in millions of board feet which Utah 

 national forests can grow annually 



National forest 



Engel- 

 mann 

 spruce 



Western 



yellow 



pine 



Douglas 

 fir 



Lodge- 

 pole 

 pine 



Alpine 

 fir 



Other 

 conifers 



Total 





4,513 

 143 



1,525 



1,562 

 709 



2,313 



. 2, 136 



1,308 

 458 

 976 

 493 

 9 

 446 

 32 



1,674 

 752 



1,115 



11, 786 







19, 743 





110 

 247 

 428 





788 





2,911 

 151 



1,351 

 179 



231 

 123 

 123 



131 



5,890 



Fishlake - - - - 





2,757 



La Sal 





2,192 







861 



24 



1,430 



626 

 1,459 



3,930 







56 



Powell 



2,638 

 .. 1,269 



11, 888 





1,191 



18, 821 





271 

 17,294 



2,918 





8,272 



25 



22 



28,187 







Total 



22, 944 



18, 641 



7,263 



29, 428 



5,185 



1,821 



85,282 







