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May 8,1921 June 12-13, 1921 June 13,1921 June 18, 1921 June 21, 1921 June 22,1921 June 23, 1921 June 23, 1921 June 24, 1921 EC. LaRue installed a temporary inclined staff gage on the right bank (fig, 1 C). This gage is herein referred to as the "LaRue Gage." This gage was not graduated and was read twice daily by measuring down with a tape from a nail used as a reference point. H,A. Schenck (Chief of Surveys, Southern California Edison Company) later told Roger C. Rice (District Engineer, USGS) that the slope of this gage was approximately 2: 1 (which cOlTesponds to an angle of about 26034'). E,C. LaRue later said that he thought the slope of the gage was closer to 320, The first reading of stage was made at 6:00 p.m, The LaRue Gage was overtopped by water between 5 p,m. on June 12 and 6:00 a,m, on June 13, Frank T. Johnson, the observer, continued to measure the stage twice daily after the gage was overtopped by "pegging" up the slope above the gage. This method consisted of inserting a stick at the edge of water and then later measuring the change in stage on the stick and inserting a new stick at the new edge of water. G,S. Stevens (in a memorandum dated March IS, 1924, in Appendix OJ later estimated that the first two "pegged" measurements, because of their much larger magnitude. were probably measurements up the sloping bank and were not vertical measurements. Roger C. Rice (USGS) drafted a letter to H.W Dennis (Construction Engineer, Southern California Edison Company) detailing the plan of cooperation between the USGS and the Southern Califomia Edison Company for the establishment of the Lees Ferry gaging station, Under this agreement, the USGS would serve in a general advisory capacity. provide all current-meter equipment, and would process all of the data collected at the site. The Southern Califomia Edison Company would then assume responsibility for the cost of all gage-related construction, and would pay two resident hydrographers to make gage-height observations, discharge measurements, and pelform maintenance. Peak of the June 1921 flood occurred at 2:00 p.m. Frank T Johnson marked the high-water elevation as the top of nail in vertical board on the south side of the road near a wash, As the flow receded, Johnson continued to record the stage twice daily by "pegging" down the slope, H,A. Schenck (Southem California Edison Company) and Roger C. Rice (USGS) met in Flagstaff, Arizona, to discuss the details of establishing the Lees Ferry gaging station. Anangements were made with the Flagstaff Lumber Company to fmnish the material for the A-li'ames and cable car for the discharge-measurement cableway, Anangements were made with P,S. Solberg, 309 South Beaver Street, Flagstaff, to do the carpentry. H.A. Schenck and Roger C. Rice visit Lees Ferry with survey party, Elevation of high-water mark near the future site of the permanent Lees Ferry Gage at the dugway was determined, They approved the location for the discharge measurement cableway that was previously selected by E,C. LaRue. This location is marked as the "Upper Cableway" in fig, 1 C, and is herein refen'ed to as the Upper Cab1eway. Jerry Johnson told Roger Rice that the peak stage of the 1884 flood was 2 ft higher than the peak stage of the 1921 flood. The flow receded to below the top of the LaRue Gage, Frank T. Johnson found that the lower part of the gage had broken loose and that the top part had rotated out of position. He installed a new temporary inclined staff gage, with a new slope of 24035'. This gage became known as the "Number 1 Gage." Johnson stated that he thought the reference-point nail for the Number 1 Gage was at the same elevation as the reference point for the LaRue Gage, but he was not completely sure of his observation. G.c. Stevens later estimated in a memorandum dated November 22, 1923 (Appendix D), that the reference point for the new -fJ221S Appendix B 67