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<br />A, 70 <br />60 <br /> <br />(f)W <br />~ g 50 <br />0>- <br />ll. co 40 <br />00 <br />a:~ <br />W 030 <br />COw <br />;2;1l. <br />=> ll. 20 <br />z<( <br /> <br />CLOSURE OF <br />GLEN CANYON DAM <br /> <br />10 <br /> <br /> <br />\ <br /> <br />o <br />1920 1930 <br /> <br />1940 1950 1960 1970 1980 1990 <br />WATER YEAR <br /> <br />B. <br /> <br /> <br />c, <br /> <br /> <br />ICE <br />Errs <br />y-~:~V <br /> <br />1-8-1947 <br />DATE <br /> <br />Figure 16. The pre-dam effects of ice at the Lees Ferry gaging station. (A) Number of days during each water year between 1922 <br />and 1986 when the stage measured at the Lees Ferry Gage was affected by ice. {Ei View of the ice breaking up in front of the <br />Lees Ferry Gage from the right bank, Photograph taken by the US Geological Survey, probably between December 17 and 23, <br />1927,(0 The most typical type of ice effect, as shown by the January 7-9. 1947. stage.recorder graph from the Lees Ferry Gage, <br />Dashed line IS the stage corrected for the effect of the ice (this is the stage that was digitized in this studyJ <br /> <br />(",". .- <br /> <br />36 Computation and Analysis of the Instantaneous-Discharge Record for the Colorado River at Lees Ferry, Arizona-May 8. 1921. through September 30. 2000 <br /> <br />