. An economic analysis of accelerated road construction on the Bureau of Land Management's Tillamook Resource Area. Roads Economic aspects United States. Figure allowable cut is composed of (1) all volume removed from the harvest unit and (2) the road right-of-way, and (3) a fraction of the volume from thinning units. An important observation is that a relatively large amount of thinning could be undertaken without building more roads in the Tillamook Resource Area. Approximately 5,000 acres were accessible for subsequent periodic thinning at the end of calendar year 1967. Total additio
. An economic analysis of accelerated road construction on the Bureau of Land Management's Tillamook Resource Area. Roads Economic aspects United States. Figure allowable cut is composed of (1) all volume removed from the harvest unit and (2) the road right-of-way, and (3) a fraction of the volume from thinning units. An important observation is that a relatively large amount of thinning could be undertaken without building more roads in the Tillamook Resource Area. Approximately 5,000 acres were accessible for subsequent periodic thinning at the end of calendar year 1967. Total additional acreage exposed and thinned during the first decade would be 4, 660 acres in the case of the 1 5-mile-per-year plan and 5,955 acres for the 30-mile plan. But by the end of the 1 6-year invest- ment period, total acres initially thinned would be the same for both plans. The "oldest-first" rule was used in scheduling harvest cutting operations. In addition, within age classes, lightly stocked stands were given precedence over more heavily stocked stands. As has been mentioned, the allowable cut allocated to final harvest cut operations is computed after deducting right-of- way and "chargeable" thinning volumes (see Appendix D for example of how the harvest-cut portion of the annual allowable cut is allocated to various age and stocking classes). Figure 5 compares the two road programs regarding amount, timing, and composition of the conifer timber harvesting activity during the 1 6-year in- vestment period. The most significant difference is the composition of the million board-foot annual allowable cut. This difference results mainly from the timing of road right-of-way clearing. 10 J. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Schallau, Con H. cn. Portland, Or. : Pacific Nor
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