. Effect of logging roads on sediment production rates in the Idaho Batholith. STUDY AREA AND METHODS The study area is within the confines of the Zena Creek logging study area near the head of the Deep Creek drainage, a tributary to the Secesh River. Three contiguous, ephemeral drainages comprise the 10-acre area (fig. 2). Annual precipitation at the study area averages inches, of which about 60 percent occurs as snow. The dominant tree species are ponderosa pine {Pinus ponderosa Laws.) and Douglas- fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco). The coarse, loamy sand soils ar
. Effect of logging roads on sediment production rates in the Idaho Batholith. STUDY AREA AND METHODS The study area is within the confines of the Zena Creek logging study area near the head of the Deep Creek drainage, a tributary to the Secesh River. Three contiguous, ephemeral drainages comprise the 10-acre area (fig. 2). Annual precipitation at the study area averages inches, of which about 60 percent occurs as snow. The dominant tree species are ponderosa pine {Pinus ponderosa Laws.) and Douglas- fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco). The coarse, loamy sand soils are derived from quartz monzonite bedrock and are poorly developed,exhibiting only A and C horizons. Additional descriptive data are summarized in table 1. Figure 2.—Schematic map of the study watersheds. SCALE IN FEET 200 400 DRAINAGE DIVIDE. LEGEND O Sediment dam drainage divide Sediment dam with watershed number Recording rain gage Storage rain gage Logs and debris Old debris avalanche Sediment flow path (as of 5/8/62) 3. 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 Megahan, Walter F. cn; Kidd, Walter J. Ogden, Utah : Intermountain Forest & Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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