WSP00979

• File Number: 8220.101.10.A
• Description: Colorado River-Water Projects-Glen Canyon Dam/Lake Powell-Glen Canyon Adaptive Management-AMWG
• State: AZ
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 3/3/2004
• Author: USGS
• Title: AMWG Meeting Attachments-March 3-4 2004-Computation and Analysis of the Instantaneous Discharge Record for the Colorado River at Lees Ferry-Arizona May 8 1921-Sep 30 2000
• Water Supply Pro - Doc Type: Report/Study

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Figure 84, The Number 1 Gage (photographs by R,C, Rice. U,S, Geological Survey, September-October 19211, (AI Downstream view of the inclined higher.
water section of the Number 1 Gage on about September 20, 1921. This was the gage built by the observer, Frank 1. Johnson, aher the crest of the June
1921 flood. It was read by taping down from a nail used as a reference point. The trench was dug to connect the gage to the river. The vertical low-water
enamel section had not yet been installed when this picture was taken. Peak stage of the June 1921 flood was measured at 30.89 feet on this gage, This
stage equals an elevation of 3,133.50 feet above the NGVD1929,IbJ October 3, 1921, downstream view of the vertlCallow.watersection of Number 1 Gage
installed by Roger C. Rice on September 25, 1921. Elmer Johnson, assistant gage obselVer and hydrographer, standing next to gage. Location of Dugway
Gage on the left bank is indicated.

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Appendix B 77