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032347 1000 en Q::..J Ww ....> Ww ~...J ~lfj zen Ow -> ....0 :;;ca w<( ..J w 900 800 ..c: lower Marble Canyon gage 700 Grand Canyoo gage .c: ~ >.c: upper Grand Canyon lower Marble Canyon <28> <sr 7100 7400 < > 38 3600 ~ . Lees Ferry gage upper Marble Canyon >< > Glen Canyon < > 33 3500 <22 > 5900 400 ~ ~ ;t: 200 Z s: m -f m 0 ::u cn 2750 m3/s ;, 80 60 40 20 lOCATION. IN RIVER MilE o Figure 5. Graph showing longitudinal profile of the Colorado River and reach average channel width at 85 and 2750 m3ts. The profile data are those collected by the GCMRC and analyzed by Magirl et al. (unpubl. manuscript). Depth to bedrock data are those reported in Table 2. Double bar arrows are the extent of the 5 study reaches shown in Figure 1. The upper number is the number of EDZs (eddy deposition zones) per river km and the lower number is the median area of the EDZs, in square meters. .,........-' A. B. Figure 6. Photographs of the Colorado River. A. Upstream view in lower Marble Canyon across the debris fan at the mouth of Little Nankoweap Creek, near River Mile 52. Valley width is relatively wide here. B. Downstream view immediately downstream from Unkar Rapid in upper Grand Canyon near River Mile 73. Here, the valley abruptly narrows in the upper part of the photograh where the resistant lower part of the Precambrian Dox formation is encountered. The riffle in the center of this photograph occurs where the river flows over the gravel bar at the downstream end of the Unkar fan-eddy complex. 3.0 The Valley of the Colorado River 9