Land class 



Category A (commercial): 

 Full yields expected 

 Modified yields expected 

 Total — Category A 



Category B (marginal): 



Potentially usable stable land: 



Full yields expected 



Modified yields expected 

 Potentially usable unstable and steep 



Unstable 40-60% slopes 



Slopes over 60% 



Total — Category B 



Total — Timber Growing Base 



Category C (noncommercial): 



Unproductive forest land: 

 Photo 



Field adjustment 

 Productive unsuitable forest land: 



Unstable 



Isolated patches 

 Productive unavailable forest land: 



Crest zone 



Travel-water influence 

 Other use conflicts 

 Total — Category C 



Category D (deferred): 



NONFOREST LAND 

 TOTAL ALL LAND 



REGION 3 - COCONINO 

 NATIONAL FOREST 



The Coconino National Forest in northern 

 Arizona was selected by the Southwestern For- 

 est Service Region 3 as a study area. This forest 

 of 1,774,710 acres on the Arizona Plateau is 

 lEirgely a ponderosa pine forest and is for the 

 most part stable. Some fir and spruce occur, 

 primarily in the San Francisco Peaks area of the 



Area in acres 



308,026 

 28,650 



336,676 



11,790 

 5,451 



land: 



41,838 

 3,816 



62,895 

 399,571 



45,418 

 67,185 



2,193 

 9,908 



21,889 

 53,324 

 52,350 



252,267 

 64,885 



231,114 

 947,837 



Forest. A significant amount of the area is for- 

 ested but the soil is not considered suitable for 

 timber growing. Also, there are limited areas 

 not considered operable at this time with the 

 technology available. 



Generally speaking, the Coconino National 

 Forest is low in productivity. While there is 

 some forest land (about 14 percent) capable of 

 producing in excess of 50 cubic feet of wood 

 per acre per year, the remainder has a yield 



35 



