<br />FIGURES
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<br />1.
<br />2,3,
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<br />9,10,
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<br />12, 13.
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<br />19-23,
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<br />IV Contents
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<br />4.
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<br />Maps of the Colorado River drainage basin and Lees Feny..................................,...............,.....................
<br />Photographs showing:
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<br />2. The Lees Ferry Gage...,."..........."".,........"""........"""...........""..... ...." ,..,...' .... ....,... ......... ......",..........
<br />3, The Upper and Lower Cableways....... .....".. ,........".."......."",........""",.,...."""..,...,.""...,...,",.. ....... ,.,
<br />Graphs showing the flattening water-surface pl'Omes with increasing stage and the reversal
<br />in curvature of the stage-discharge rating curve .......................................................................,...................
<br />Photographs showing flow over the gravel bar at the mouth of the Paria River at a range of
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<br />disehar.ges.............................,..........................,.."........................,....................,........,..,......,....,........,.........,..
<br />Graph showing water-surface slopes as a function of stage.........,...............................................................
<br />Graph comparing the stage-discharge rating curve defined by the discharge measurements
<br />made during water-years 1921-22 with the revised stage-discharge rating curve of Gatewood
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<br />and Hunter........................................,..,.. ......... .......... .......... ........,.. ......................................................,..........
<br />Graphs showing the stage-discharge rating curves at the Lees Ferry Gage defined by discharge
<br />measurements during the 6 high-discharge water years with substantial data above a
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<br />stage of 17 feet........."""........"",.. ........,.."...... ......", ....,.., ........,...... .......... .....,...........,..........."",......,...",..",.
<br />Photographs showing:
<br />9, The high-water marks from the 1921 flood and graph used to estimate the peak discharges
<br />of the 1921 and 1884 floods at the Grand Canyon gaging station..........,.........."................................
<br />10, A discharge measurement being made by the U.S, Reclamation Service on the morning of
<br />June 27, 1921, at the Yuma gaging station, near the peak ofthe .Iune 1921 HooeL..........................
<br />Graphs comparing the May through .Iune daily mean discharge of the San Juan River with the
<br />combined previous day's discharge of the Animas and Florida Rivers during water years
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<br />1928-37,.. ,..........."".........".."..........."".",........""". ......." .......... .......,............... ....."....,......,.,..",.....,.""",."..
<br />Graphs showing:
<br />12. Linear and power-law extrapolations of the stage-discharge rating curves at the Lees Ferry,
<br />Number 4, Cable, and Number I Gages ..,..............,.........................................."......................,.........,
<br />13. Tbe stage-discharge rating curve used in this study for the period between May 8, 1921,
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<br />and June 25, 1921 ""... ......"" ....,...."""". .......,.. ....,..... ...,..........,.."........."",..,......""",......""",......."....,
<br />Photographs showing the River-mile 233,7 driftwood deposiL..............,................,.................................
<br />Graph showing the number of discharge measurements made at Lees Ferry during each water
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<br />year' between 1921 and 1986....."""".......""" ..",...........,.. .............................",...........""".......""".......,',....,
<br />Graph and photographs showing the pre-dam effects of ice at the Lees Ferry gaging station...................
<br />Graph showing the number of days when the daily mean discharge record at Lees Ferry was
<br />modified on the basis of the discharge record at the Grand Canyon gaging station ".................................
<br />Graph comparing the computed instantaneous discharge for April-August 1921 at Lees
<br />Ferry with the discharge at upstream and downstream gaging stations .................,....................................
<br />Graphs showing:
<br />19, An example of the cause of an error in the published daily mean discharge record......................,...
<br />20, The percent disagreement between the daily mean discharges computed from
<br />the continuous record of instantaneous discharge ll'om this study and the published
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<br />daily mean discharges......"..,.........",...........".",........."",......,." ......... ......,.. ........,... ........... .....,... ..........
<br />21. The (A) contrnu'ous record of the instantaneous discharge aud the (il) daily range in the
<br />c1iseharge ofthe Colorado River at Lees Ferry from May 8, 1921, through
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<br />September 30, 2000"..,......""",.........",., ......, , ........,............................"".....,..",.,....."",.."...,' ......,... ....,
<br />22, Flow-duration curves for the Colorado River at Lees Ferry...................,........".......,..........................
<br />23. The pre-dam monthly median, minimum, and maximum discharges of the Colorado
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<br />Ri ver at Lees Ferry....."",........""".......""",............ ......' ..........,..........".... ,....,." ".....'"..........""".....'",.
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<br />II.
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