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<br />Moab Site - 9/24/84 <br /> <br />Air photos - 1944 set ShOWS shallow bars developed in reaCh. No <br /> <br />SUCh evidence exists for 1980 photos or cross-section surveys. <br />Reach appears to De controlled by alluvium deposition downstream <br />(near Big Bend on topographic map) from side canyon. Older <br />photo set indicates numerous bars, unvegetated. Recent photos <br />illustrate vegetated bars and fewer bars. <br /> <br />Conclusion: Physical conditions have changed - fewer bars, more <br />regular (canal-like) cross sections have developed. <br /> <br />Black Rocks Site - 9/24/84 <br /> <br />... <br />Air photos - very similar conditions exist for 1958 and 1980 <br /> <br />photo sets, vegetation, number of bars, bar location and size <br />appear constant throughout study reach. Cross section 1 assumed <br />to be at USGS State line gage. Cross sections similar at all <br />flows. <br /> <br />. <br /> <br />C~nclusion: Physical conditions have not Changed in this reach. <br />