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<br />Walter Walker Site - 9/27/84 <br /> <br />Morphology changes are possible due to proximity of gravel <br />mining operation (downstream) and urbanization. South bank- <br />prominent cliff, alluvium that forms bend could be unstable and <br />erodible. <br /> <br />Air photoS: 1954 photos shOWS numerous active siae channels of <br />Colorado which appear inactive in 1980 photoS. Bend in channel <br />appears less severe in 1954 than in 1980 photos, but differences <br />in flow may account for this. River and floodplain have been <br /> <br />modified between 1954 and 1980 by gravel mining and changes in <br />flow patterns through the old mined-out pits Should be consi- <br />dered a permanent adjustment in morphology or, if the dikes are <br />... <br />reconstructed, will likely occur again. Existing conditions a~ <br />this site do not appear to be representative of historical con- <br />ditions and are currently influenced by the downstream gravel <br /> <br />pit. The highway downstream of the gravel pit impinges upon the <br />historical floOdplain. This may also influence current channel <br />conditions. Substrate is apparently dominated by cobble-sized <br /> <br />material. <br /> <br />Conclusion: Current conditions are maintained by flOOdplain <br />manipulation. <br />