Abstract
The objective of our 1979 research activities in Yellowstone National Park was to obtain photoelectric trail counts of hikers and backpackers using backcountry trails included in our 1978 backcountry trail use study. In the design of the 1978 study the Park Service was to furnish 14 photoelectric trail counters. The counts from these trail counters were to be the base for the estimates of total backcountry use. The number of users recorded by the trail counters for each trail was to be correlated with the number of trail users recorded on the trailhead registration forms to develop expansion ratios for the various trails. With these ratios, estimates of total backcountry use could be ascertained in future years by multiplying the number of trail users recorded on the registration forms by the appropriate expansion ratios.
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