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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Elkhead Creek Aquatic Resource Report <br />Miller Ecological Consultants, December 5, 1996 <br />Table 4. Physical habitat codes for Basinwide habitat mapping data. <br />13 <br />Basinwlde_Habitat Number <br />Habitat I)cscription <br />1 Glide <br />2 Secondary Channel Pool <br />3 Backwater Pool <br />4 Trench Pool <br />5 Phinge Pool <br />6 Lateral Scour Pool <br />7 Dain Pool <br />8 Secondary Channel Riffle <br />9 Riffle associated with Bedrock <br />10 Riffle associated with Boulders <br />11 Riffle associated with Cobble <br />12 Rife associated with Gravel <br />13 Riffle associated with Sand or Silt <br />14 Rapid <br />15 Cascade <br />Average depth and maximum depth of the various habitat types appear to be similar <br />between the two sites (Table 5). Substrate in pools was similar at Sites 1 and 2, but <br />substrate size in glides and riffles was considerably larger at Site 2 (Table 6). Bank <br />stability and rock content varied somewhat between sites (Appendix C); however, the <br />total feet of eroding banks was considerably greater at Site 1 (380 ft) than Site 2 (60 ft). <br />Three types of cover were described at Site I in pool and glide habitat. Cover types at <br />Site 1 included instream cover, overhead cover and pool depth cover. Cover types at Site <br />2 included instream cover and pool depth cover. The most common occurring cover type <br />at both sites was depth cover confined to the pools. Site 2 contained approximately twice <br />as much quantifiable cover as Site I (Table 7). <br />In many ways habitat appears to be very similar between Sites 1 and 2. It is likely that the <br />differences between the two sites may be the result of grazing pressure at Site 1. Although <br />the differences in. most cases are slight, Site 1 has less cover, less pool habitat, and more <br />eroding stream banks. These conditions are often attributed to the effects of grazing.