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<br />FIGURES <br /> <br />1. <br />2,3, <br /> <br />9,10, <br /> <br />12, 13. <br /> <br />19-23, <br /> <br />IV Contents <br /> <br />4. <br /> <br />Maps of the Colorado River drainage basin and Lees Feny..................................,...............,..................... <br />Photographs showing: <br /> <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 <br /> <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 <br /> <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 <br /> <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 <br /> <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, <br /> <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 <br /> <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 <br /> <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 <br /> <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 <br /> <br />Ri ver at Lees Ferry....."",........""".......""",............ ......' ..........,..........".... ,....,." ".....'"..........""".....'",. <br /> <br />5. <br /> <br />6. <br />7. <br /> <br />8, <br /> <br />II. <br /> <br />14. <br />15. <br /> <br />16. <br />17. <br /> <br />18. <br /> <br />3 <br />9 <br />10 <br />12 <br />14 <br />16 <br />20 <br />21 <br />22 <br />25 <br />26 I <br />27 l <br /> l <br /> I <br />30 I <br />32 <br />33 <br />36 <br />37 <br />38 <br />40 <br />41 <br />42 <br />44 <br />44 <br />