able core greater than the maximum allowable size listed in table 11 of A Manual of 

 Instruction for Log Scaling and the Measurement of Timber Products (State of Idaho V0- 

 ED No. 38) are not considered merchantable. Checks, splits, crook, and blue stain are 

 not considered as defects in determining pulpwood volume. 



Pre-Harvest Inventory 



The pre-harvest inventory was found by adding green and dead pieces containing 10 

 or more gross board feet to the volume of the residual stand and scaled logs removed. 

 Table 1 shows the pre-harvest volumes. 



Table 1 — Preharvest volumes on north Idaho timber sales 









Volumes per acre 







Sale 



: Sale 





: : Green 



Dead : 





name 



: size 



: Removed 



: Residual : Residue 



Residue : 



Total 



Acres Thousand board feet 



Danby Ridge 57.0 15.7 0.1 2.8 3.9 22.5 



Lee Creek 23.0 9.8 2.5 1.7 4.8 18.8 



Includes trees that blew down following logging. 



Post-Harvest Inventory 



Board foot and cubic residue volumes (pieces 8 feet [2.44 m] and longer and 3 inches 

 [7.62 cm] and more in diameter) left after conventional logging are shown in table 2. 

 Principle findings are: 



1. Dead residue made up most of the gross volume on both study areas; however, 

 green pieces were more abundant in both instances. 



2. Rot was rather evenly spread between green and dead material on Danby Ridge 

 regardless of piece volume. Large pieces, both dead and green, contained a 

 high percentage of cull material on Lee Creek. Small pieces (less than 3 cubic 

 feet) were generally defect free. 



3. Useable (net) residue pieces on Danby Ridge were larger and less numerous than 

 those on Lee Creek. 



Because conventional methods of board-foot measure disregard pieces with end dia- 

 meters less than 6 inches (15.24 cm), cubic volume provides a much better measure of 

 total volumes than board-foot volume. However, a board foot: cubic foot ratio was 

 desired to allow referral to the Pre-Harvest Inventory (table 1) and permit further cat- 

 egorization of the residue occurring on the two sites. Because this ratio is greatly 

 influenced by piece size, a general ratio to cover the range of diameters was needed. 

 On Lee Creek, dead residue (material dead before initial harvesting) was larger than 



5 



