Contents 



Page 



INTRODUCTION 1 



PROCEDURE FOR DETERMINING THE TIMBER BASE 3 



OVERESTIMATION OF THE TIMBER GROWING BASE 4 



VARIATIONS WITHIN THE TIMBER GROWING BASE 6 



SOURCES OF THE PROBLEM AND DEVELOPMENT OF MORE USEFUL 



AND REALISTIC AREA DATA 8 



MORE REALISTIC STRATIFICATION OF THE TIMBER GROWING BASE 



IS NEEDED 9 



GENERAL OBSERVATIONS 12 



RESULTS 13 



Low Productivity 13 



Land Instability 15 



Small Isolated Patches 17 



Land Use Conflicts 19 



EFFECT OF CRITERIA USED ON PRODUCTIVE CAPACITY 20 



RECOMMENDATIONS 22 



APPENDIX 25 



PROCEDURE FOR TIMBER INVENTORY 26 



Double Sampling Procedure 26 



Single Sampling Procedure 28 



DETAILS ON OTHER UNITS 32 



Region 1 — Lolo Unit 32 



Region 2 — Arapaho National Forest 34 



Region 3 — Coconino National Forest 35 



Region 4 — Boise Unit 37 



iii 



