Assessment - Southern Oregon Digital Archives
Assessment - Southern Oregon Digital Archives
Assessment - Southern Oregon Digital Archives
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Appendix F: Williams Creek Watershed-Soil Units (continued)<br />
Vannoy-Manita-Voorhies (Map Unit 7)<br />
Vannoy and Voorhies soils are on mountain sides. Manita soils are found on mountain sides,<br />
hillslopes and alluvial fans. These soils are formed in colluvium and alluvium derived from<br />
altered sedimentary and extrusive igneous rock.<br />
Characteristics: Deep and moderately deep, well drained silt loam, loam and very<br />
gravelly loam.<br />
Slopes: 2-55 %<br />
Depth to bedrock: 20-40 inches or more<br />
Elevation: 800-4,000 feet<br />
Average annual precipitation: 30-40 inches<br />
Frost-free season: 120-170 days<br />
Erosion hazard: moderate to high<br />
Josephine-Speaker-Pollard (Map Unit 8)<br />
Josephine and Speaker soils are on mountainsides and ridges. Pollard soils are found on high<br />
stream terraces, in saddles and on hill sides. These soils formed in colluvium and residuum<br />
derived dominantly from altered sedimentary and extrusive igneous rock.<br />
Characteristics: Deep and moderately deep, well drained gravelly loam, and loam.<br />
Slopes: 20-55 %<br />
Depth to bedrock: 20-40 inches or more<br />
Elevation: 1,000-4,000 feet<br />
Average annual precipitation: 35-60 inches<br />
Frost-free season: 100-170 days<br />
Erosion hazard: moderate to high<br />
Beekman-Vermisa-Colestein (Map Unit 9)<br />
This soil unit occurs mainly on mountain sides. These soils formed in colluvium derived from<br />
altered sedimentary and extrusive igneous rock.<br />
Characteristics: Moderately deep and shallow, well drained, and excessively welldrained,<br />
extremely gravelly loam and gravelly loam.<br />
Slopes: 50-100 %<br />
Depth to bedrock: 12-40 inches or more<br />
Elevation: 1,000-4,000 feet<br />
Average annual precipitation: 35-60 inches<br />
Frost-free season: 100-160 days<br />
Erosion hazard: moderate to high<br />
Williams Creek Watershed <strong>Assessment</strong> 23