Availability Classes 



An availability class was designated for the different types of land 

 included in each land class. Using standard land as Availability Class I, 

 where full yields can be expected to be available, other availability classes 

 were defined as a percentage of the standard land yields expected, consider- 

 ing the impacts of other uses. 



In this manner, it was possible to estimate the amount that timber yields 

 would be reduced because of nontimber use constraints. For Working Circle 

 3 , this amount proved to be equivalent to reducing the commercial forest land 

 area by 16 percent. 



Table 34 shows the amount of land in each land class. 



Table 33. Availability class definitions and components. 



Land Class 



Availability 

 Class 



% of Standard Land 

 Yield Expected 



Definition 



Standard 



Special 



Special 



I 



I 



II 



100 



100 



90 



Standard land definition 



Big game winter range 



Travel and municipal 

 influence zone 



Special 



III 



75 



Ski resort, recreation, 

 and subdivision 

 influence zones 



Special 



IV 



50 



Water influence zones 

 and other private 

 individual owner 



Special 



V 



Subdivided land. State 

 Department of Fish, 

 Wildlife and Parks land, 

 and miscellaneous 

 Federal land 



Marginal 



IV 



50 



Steep slopes (greater 

 than 64%) , all land 

 greater than 8,000 feet 

 in elevation, and all 

 land that has a land- 

 scape stability class 

 rating of III (Stability 

 data available only west 

 of Divide) 



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