Laserfiche WebLink
<br />3.6 <br /> <br />Table 3.1. Summary of General Basin Characteristics. <br /> <br />Characteristic <br /> <br />Cascade Creek <br /> <br />Portland Creek <br /> <br />Area <br /> <br />Max~ Elevation <br /> <br />Minimum Elevation <br /> <br />Upper Basin Slopes <br /> <br />Average Upper Basin Slope <br /> <br />Upper Channel Slope <br /> <br />Debris Fan Slopes <br /> <br />Average Debris Fan Slopes <br /> <br />Major Debris Source <br /> <br />Composition of Debris <br /> <br />Geology of Headwaters <br /> <br />2.8 <br /> <br />,2 <br />m:J. <br /> <br />1.3 ,2 <br />IIU. <br />12,800 <br />7,685 <br />30 to 70% <br />45% <br />15 to 30% <br /> <br />4.5 to 18% <br /> <br />13% <br /> <br />TaluS" slopes, rockfall <br />slopes, and thick <br />colluvium <br /> <br />Larger percentage of <br />coarse, angular boulders <br />and less fines and <br />rounded cobbles <br /> <br />San Juan Volcanic <br /> <br />12,800 <br /> <br />7,725 <br /> <br />30 to 100% <br /> <br />80% <br /> <br />15 to 67% <br /> <br />8 to 10% <br /> <br />9% <br /> <br />Rockfall slopes, <br />glacial drift and <br />thick colluvium, <br />and landslides <br /> <br />Larger percentage of <br />fines and rounded <br />cobbles <br /> <br />San Juan Volcanic <br />